Document and Entity Information Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Filer Category Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Condensed Consolidated Statements of Income and Comprehensive Income Condensed Consolidated Statements of Income and Comprehensive Income Revenues [Abstract] Operating Revenue: This element represents revenue earned primarily through the carriage of containerized freight between various US Pacific Coast, Hawaii, Guam, Micronesia, China and other Pacific island ports. Ocean Transportation Ocean Transportation This element represents revenue from rail intermodal, highway brokerage and warehousing. Logistics Services Logistics Revenue, Net Operating Revenue Total Operating Revenue Costs and Expenses [Abstract] Costs and Expenses: Operating Costs and Expenses Operating costs Income (Loss) from Equity Method Investments Equity in income of related party Terminal Joint Venture Equity in income of related party Terminal Joint Venture Selling, General and Administrative Expense Selling, general and administrative Costs and Expenses Total Costs and Expenses Operating Income (Loss) Operating Income Operating Income Interest Expense Interest expense Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income before Income Taxes Income Tax Expense (Benefit) Income tax expense Income taxes Net Income (Loss) Attributable to Parent Net Income Net Income Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Income Taxes: Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] Other Comprehensive Income (Loss): Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, Net of Tax Net gain (loss) in prior service cost Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax Amortization of prior service cost Amortization of prior service cost included in net periodic pension cost Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax Amortization of net loss included in net periodic pension cost Amortization of net loss Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation and other adjustments Other Comprehensive Income, Other, Net of Tax Other comprehensive income Other Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total Other Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive Income Earnings Per Share, Basic [Abstract] Basic Earnings Per-Share: Earnings Per Share, Basic Net income, Basic (in dollars per share) Basic Earnings Per-Share (in dollars per share) Earnings Per Share, Diluted [Abstract] Diluted Earnings Per-Share: Earnings Per Share, Diluted Net income, Diluted (in dollars per share) Diluted Earnings Per-Share (in dollars per share) Earnings Per Share, Basic, Other Disclosures [Abstract] Weighted Average Number of Shares Outstanding: Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Diluted (in shares) Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Dividends Common Stock, Dividends, Per Share, Cash Paid Cash Dividends Per-Share Condensed Consolidated Balance Sheets Assets [Abstract] ASSETS Assets, Current [Abstract] Current Assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Receivables, Net, Current Accounts receivable, net Prepaid Expense and Other Assets, Current Prepaid expenses and other assets Assets, Current Total current assets Assets, Noncurrent [Abstract] Long-term Assets: Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investment in related party Terminal Joint Venture Property, Plant and Equipment, Net Property and equipment, net Goodwill Balance at the end of the period Balance at the beginning of the period Finite-Lived Intangible Assets, Net Intangible assets, net Restricted Cash and Cash Equivalents Capital Construction Fund - cash on deposit Deferred Costs, Noncurrent Deferred dry-docking costs Other Assets, Noncurrent Other long-term assets Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities, Current [Abstract] Current Liabilities: Debt, Current Current portion of debt Accounts Payable, Current Accounts payable Employee-related Liabilities, Current Payroll and vacation liabilities Self Insurance Reserve, Current Uninsured liabilities Accrued Liabilities and Other Liabilities Accrued and other liabilities Liabilities, Current Total current liabilities Liabilities, Noncurrent [Abstract] Long-term Liabilities: Long-term Debt, Excluding Current Maturities Long-term debt Deferred Tax Liabilities, Net, Noncurrent Deferred income taxes Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent Employee benefit plans Other Liabilities, Noncurrent Uninsured and other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities Multi-employer withdrawal liabilities Liabilities, Noncurrent Total long-term liabilities Commitments and Contingencies. Commitments and Contingencies (Note 2) Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' Equity: Common Stock, Value, Issued Capital stock Additional Paid in Capital, Common Stock Additional paid in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Retained Earnings (Accumulated Deficit) Retained earnings Stockholders' Equity Attributable to Parent Balance at the end of the period Balance at the beginning of the period Total shareholders' equity Liabilities and Equity Total liabilities and shareholders' equity Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash Flows From Operating Activities: Income (Loss) from Continuing Operations Attributable to Parent Net income Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Reconciling adjustments: Depreciation, Depletion and Amortization Depreciation and amortization Deferred Income Tax Expense (Benefit) Deferred income taxes Share-based Compensation. Share-based compensation expense Proceeds from Contributions from Affiliates Distributions from Terminal Joint Venture Other Operating Activities, Cash Flow Statement Other Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Accounts and Notes Receivable Accounts receivable Represents the increase (decrease) during the reporting period in the value of dry-docking payments made during the current reporting period for benefits that will be received over a period of years. Increase (Decrease) in Deferred Dry Docking Payments Deferred dry-docking payments Represents the increase (decrease) during the reporting period in the value of dry-docking amortization during the current reporting period for benefits that will be received over a period of years. Increase (Decrease) in Deferred Dry Docking Amortization Deferred dry-docking amortization Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accounts Payable Accounts payable and accrued liabilities Increase (Decrease) in Other Operating Liabilities Other liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash Flows From Investing Activities: Payments to Acquire Productive Assets Capital expenditures Payments for Construction in Process Capitalized vessel construction expenditures Proceeds from Sale of Productive Assets Proceeds from disposal of property and equipment Increase in Restricted Cash Cash deposits into Capital Construction Fund Cash Deposits Into CCF Decrease in Restricted Cash Withdrawals from Capital Construction Fund Payments to Acquire Business Two, Net of Cash Acquired Payments for membership interests in Span Alaska, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Payments for Horizon’s common stock, net of cash acquired, and other acquisitions Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash Flows From Financing Activities: Repayments of Debt and Capital Lease Obligations Repayments of debt and capital leases Proceeds from Lines of Credit Proceeds from revolving credit facility Repayments of Lines of Credit Repayments of revolving credit facility Payment of Financing and Stock Issuance Costs Payments of financing costs Proceeds from Issuance of Long-term Debt Proceeds from issuance of debt Repayments of Assumed Debt Repayments of Span Alaska debt Repayments of Span Alaska debt Represents the repayments of the debt of the acquired entity and the redemption of warrants, net. Repayments Of Acquiree Debt And Redemption Of Warrants Repayments of Horizon debt and redemption of warrants Proceeds from Issuance of Common Stock Proceeds from issuance of capital stock Payments Related to Tax Withholding for Share-based Compensation Tax withholding related to net share settlements of restricted stock units Payments of Ordinary Dividends, Common Stock Dividends paid Payments for Repurchase of Common Stock Payments for shares repurchased Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by (used in) financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net Decrease in Cash and Cash Equivalents Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations Cash and cash equivalents, end of the period Cash and cash equivalents, beginning of the period Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information: Interest Paid, Net Interest paid, net of capitalized interest Income Taxes Paid, Net Income tax paid Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash Information: Represents the future cash outflow to pay for purchases of fixed assets and dry-docking that have occurred. Capital Expenditures and Dry Docking Incurred but Not Yet Paid Capital expenditures included in accounts payable and accrued liabilities Capital Lease Obligations Incurred Capital lease obligations DESCRIPTION OF THE BUSINESS Business Description and Basis of Presentation [Text Block] DESCRIPTION OF THE BUSINESS GENERAL AND SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] GENERAL AND SIGNIFICANT ACCOUNTING POLICIES BUSINESS COMBINATION Business Combination Disclosure [Text Block] BUSINESS COMBINATION DEBT Debt Disclosure [Text Block] DEBT PENSION AND OTHER POST-RETIREMENT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] PENSION AND OTHER POST-RETIREMENT PLANS SHARE-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] SHARE-BASED COMPENSATION EARNINGS PER-SHARE Earnings Per Share [Text Block] EARNINGS PER-SHARE FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] FAIR VALUE MEASUREMENTS REPORTABLE SEGMENTS Segment Reporting Disclosure [Text Block] REPORTABLE SEGMENTS Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Fiscal Period, Policy [Policy Text Block] Fiscal Period Significant Accounting Policies [Text Block] Significant Accounting Policies Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Intangible Assets, Net Disclosure of the accounting policy for assets that are restricted in their use, generally by contractual agreements or regulatory requirements. This would include, but not limited to, a description of the restricted assets and the terms of the restriction. Capital Construction Fund Comprehensive Income, Policy [Policy Text Block] Accumulated Other Comprehensive Loss Commitments and Contingencies, Policy [Policy Text Block] Contingencies Disclosure of accounting policy for subsequent events. Subsequent Event Policy Text Block Subsequent Event Disclosure of accounting policy pertaining to new accounting policy for leases. New Accounting Pronouncements Leases Policy Policy Text Block New Accounting Pronouncements: Leases Disclosure of accounting policy pertaining to a new accounting policy for share-based awards. New Accounting Pronouncements Share Based Awards Policy Policy Text Block New Accounting Pronouncements: Share-Based Awards Schedule of Goodwill [Table Text Block] Schedule of goodwill Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of changes in accumulated other comprehensive loss by component, net of tax Business Acquisition [Axis] Business Acquisition Acquiree [Domain] Business Acquisition Acquiree [Domain] Information relating to acquisition of Span Alaska. Span Alaska [Member] Span Alaska Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of total consideration paid for the membership interests in Span Alaska Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Summary of estimated fair values assigned to Span Alaska’s assets acquired and liabilities assumed Business Acquisition, Pro Forma Information [Table Text Block] Schedule of pro forma financial information Schedule of Long-term Debt Instruments [Table Text Block] Schedule of debt Schedule of Net Benefit Costs [Table Text Block] Components of net periodic benefit costs (benefit) Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of basic and diluted earnings per share Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Schedule of fair value measurement Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of reportable segment information Schedule reflecting information about the organization of the business. Description of Business [Table] Segments [Axis] Segment [Domain] Segment [Domain] Represents information pertaining to ocean transportation segment that carries freight between various U.S. Pacific Coast, major Hawaii ports, Guam, China and other Pacific ports and provides terminal, stevedoring and container equipment management services in Hawaii. Ocean Transportation Segment [Member] Ocean Transportation Investment, Name [Axis] Equity Method Investee Name [Domain] Equity Method Investee Name [Domain] Represents SSA Terminals, LLC (SSAT). Ssa Terminals Llc [Member] SSAT Line items represent description about business. Description of Business [Line Items] DESCRIPTION OF THE BUSINESS Number of Reportable Segments Number of reportable segments Number of segments Represents the number of chartered vessels. Number of Chartered Vessels Number of owned vessels in fleet Business Combination, Ownership Percentage Ownership interest in SSAT (as a percent) Represents the number of ports terminal facilities on which the investee provides terminal and stevedoring services. Number of Terminal Facilities on which Investee Provides Terminal and Stevedoring Services Number of terminal facilities on which SSAT provided terminal and stevedoring services on the U.S. West Coast Business Acquisition, Percentage of Voting Interests Acquired Percentage interest acquired CAPITAL CONSTRUCTION FUND. Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation of property and equipment Amount of accumulated construction in progress payments as part of property, plant and equipment. Accumulated Construction In Progress Payments Vessel construction expenditures Accumulated Capitalized Interest Costs Capitalized interest GOODWILL AND INTANGIBLE ASSETS Schedule of Goodwill [Table] Represents information pertaining to logistics services segment that arranges domestic and international rail intermodal service, long-haul and regional highway brokerage, specialized hauling, flat-bed and project work, less-than-truckload, expedited freight services, and warehousing and distribution services. Logistics Services Segment [Member] Logistics Goodwill [Line Items] Goodwill Goodwill [Roll Forward] Changes in the Company's goodwill Goodwill, Acquired During Period Additions Finite-Lived Intangible Assets, Net [Abstract] Intangible Assets, Net Finite-Lived Intangible Assets, Accumulated Amortization Accumulated amortization of intangible assets Restricted Cash and Investments [Abstract] Capital Construction Fund Balance of eligible accounts receivable assigned to capital construction fund as of reporting date. Eligible Accounts Receivable Assigned To Capital Construction Fund Eligible accounts receivable assigned to CCF Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Changes in accumulated other comprehensive loss by component, net of taxes AOCI Attributable to Parent, Net of Tax [Roll Forward] Changes in accumulated other comprehensive loss by component, net of taxes Debt Instrument, Face Amount Debt issued Debt Instrument, Interest Rate, Stated Percentage Interest rate (as a percent) Debt Instrument, Term Debt instrument term Weighted average life of the notes. Debt instrument Average Life Weighted average life Number of days to the date on when the debt will be issued. Debt Instrument, Number Of Days To Issuance Date Number of days to issuance date Schedule of Business Acquisitions, by Acquisition [Table] Represents information pertaining to Horizon Lines, Inc. Horizon Lines Inc [Member] Horizon Business Acquisition [Line Items] Business acquisition Number of years in operation. Number of Years In Operation Number of years in operation Business Combination, Consideration Transferred [Abstract] Total cash consideration Business Combination, Consideration Transferred Total cash paid for common shares Membership interests consideration Business Combination, Consideration Transferred, Liabilities Incurred Total debt assumed Total payments to acquire the business and pay off the assumed debts from the acquisition. Payments To Acquire Business And Assumed Debts From The Acquisition Total payments Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] Assets acquired and liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Accounts receivable Amount of other assets acquired at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Other Other current and long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Intangibles – Customer relationships Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets Intangibles – Trade name Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Accruals and other current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation Capital lease obligations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Total identifiable assets less liabilities Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Common shares Amount of warrants of the acquirer in consideration for the business combination. Business Combination Consideration Transferred Equity Interests Issued And Issuable Warrants Warrants Finite-Lived Intangible Asset, Useful Life Expected useful lives Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Operating revenue Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Operating Income Business Combination, Acquisition Related Costs One-time acquisition related costs Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] Estimated future benefit payments Debt Instrument, Interest Rate During Period Interest rate during period (as a percent) Incremental borrowing rate Business Acquisition, Pro Forma Information [Abstract] Pro-forma Combined Business Acquisition, Pro Forma Revenue Operating revenue Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax Net income Business Acquisition, Pro Forma Earnings Per Share, Basic Basic Earnings Per Share (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Diluted Earnings Per Share (in dollars per share) Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted Average Number of Shares Outstanding: Weighted Average Basic Shares Outstanding, Pro Forma Basic Pro Forma Weighted Average Shares Outstanding, Diluted Diluted Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Longterm Debt Type [Domain] Longterm Debt Type [Domain] Represents the 5.79 percent term loans payable through 2020. Term Loans Payable5.79 Percent Through2020 [Member] 5.79%, payable through 2020 Represents the 3.66 percent term loans payable through 2023. Term Loans Payable3.66 Percent Through2023 [Member] 3.66%, payable through 2023 Represents the 4.16 percent term loans payable through 2027. Term Loans Payable4.16 Percent Through2027 [Member] 4.16%, payable through 2027 Represents the 4.31 percent term loans payable through 2032. Term Loans Payable4.31 Percent Through2032 [Member] 4.31%, payable through 2032 Represents the 3.14 percent term loans payable through 2031. Term Loans Payable3.14 Percent Through2031 [Member] 3.14%, payable through 2031 Represents the 4.35 percent term loans payable through 2044. Term Loans Payable4.35 Percent Through2044 [Member] 4.35%, payable through 2044 Represents the 3.92 percent term loans payable through 2045. Term Loans Payable3.92 Percent Through2045 [Member] 3.92%, payable through 2045 Represents the 5.34% secured notes payable through 2028. Secured Bonds Payable5.34 Percent Through2028 [Member] 5.34%, payable through 2028 Represents the 5.27% secured notes payable through 2029. Secured Bonds Payable5.27 Percent Through2029 [Member] 5.27%, payable through 2029 Debt Instrument [Line Items] Debt Capital Lease Obligations Capital leases Long-term Debt. Total Debt Long-term Debt, Current Maturities Less current portion Long-term Debt and Capital Lease Obligations Total Long-term Debt Debt Instrument [Axis] Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Represents information relating to 2016 Note Purchase Agreement. The2016 Note Purchase Agreement [Member] 2016 Note Purchase Agreement Represents information relating to senior unsecured notes (the “Series D Notes"). Senior Unsecured Notes Series D Notes [Member] The Senior Unsecured Notes (The "Series D Notes") Represents information relating to the senior unsecured notes - the Series B and C Notes. Senior Unsecured Notes Series B And C Notes [Member] The Senior Unsecured Notes (The "Series B And C Notes") Line of Credit Facility, Remaining Borrowing Capacity Funds available under the revolving credit facility Debt Instrument, Frequency of Periodic Payment Frequency of periodic payment Maximum ratio of debt to consolidated EBITDA for each fiscal four quarter period, except under certain pre-defined circumstances as per the covenants of the agreement. Debt Instrument, Covenant, Ratio Of Debt To Consolidated EBITDA Maximum ratio of debt to consolidated EBITDA Maximum ratio of consolidated EBITDA to interest expense as of the end of any fiscal four quarter period as per covenants of the agreement. Debt Instrument, Covenant, Ratio Of Consolidated EBITDA To Interest Expense Maximum ratio of consolidated EBITDA to interest expense Maximum ratio of aggregate principal amount of Priority Debt to Consolidated Tangible Assets at any time as per the covenants of the agreement. Debt Instrument, Covenant, Ratio Of Aggregate Principal Amount Of Priority Debt To Consolidated Tangible Assets Maximum ratio of aggregate principal amount of Priority Debt to Consolidated Tangible Assets Maximum ratio of aggregate principal amount of Priority Debt to Consolidated Tangible Assets upon earlier following second calendar year and upon the occurrence of certain events. Debt Instrument, Covenant, Ratio Of Aggregate Principal Amount Of Priority Debt To Consolidated Tangible Assets Earlier Following Fiscal Year Maximum ratio of aggregate principal amount of Priority Debt to Consolidated Tangible Assets upon certain events Maximum ratio of aggregate principal amount of priority debt not Title XI Priority Debt to Consolidated Tangible Assets at any time. Debt Instrument, Covenant, Ratio Of Aggregate Principal Amount Of Priority Debt Not Title XI Priority Debt To Consolidated Tangible Assets Maximum ratio of aggregate principal amount of priority debt not Title XI Priority Debt to Consolidated Tangible Assets Maturities of Long-term Debt [Abstract] Maturities of Long-term Debt Amount of semi-annual principal payments that the company has to pay in the year one as stated in the agreement. Long-term Debt, Maturities, Semi Annual Repayments of Principal in Year One Semi-annual principal payments in 2019 Amount of semi-annual principal payments that the company has to pay in year two to year five since the first year of maturity payment as stated in the agreement. Long-term Debt, Maturities, Semi Annual Repayments of Principal in Year Two to Year Five Semi-annual principal payments in 2020 to 2023 Amount of semi-annual principal payments that the company has to pay after year five since the first year of maturity payment as stated in the agreement. Long-term Debt, Maturities, Semi Annual Repayments of Principal After Year Five Semi-annual principal payments in 2024 to 2031 Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans [Domain] Defined Benefit Plans [Domain] Accumulated Defined Benefit Plans Adjustment [Member] Pension Benefits Accumulated other comprehensive (income) loss related to defined benefit post retirement plans attributable to the parent. Accumulated Defined Benefit Post Retirement Plans Adjustment Attributable To Parent [Member] Other Post-retirement Benefits Defined Benefit Plan Disclosure [Line Items] Pension and Post-retirement Plans Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Components of Net Periodic Benefit Costs: Defined Benefit Plan, Service Cost Service cost Defined Benefit Plan, Interest Cost Interest cost Defined Benefit Plan, Expected Return on Plan Assets Expected return on plan assets Defined Benefit Plan, Amortization of Gains (Losses) Amortization of net loss Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of prior service cost Defined Benefit Plan, Net Periodic Benefit Cost Net periodic benefit cost Defined Benefit Plan, Expected Contributions in Current Fiscal Year [Abstract] Defined Benefit Pension Plan Contributions Defined Benefit Plan, Contributions by Employer Employer contribution Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Represents information pertaining to time-based shares. Time Based And Performance Based Shares [Member] Time-based and performance-based shares Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based compensation Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Shares granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted-average grant date fair value (in dollars per share) Allocated Share-based Compensation Expense Total stock-based compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Total unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Unrecognized compensation cost over weighted-average period to be recognized Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Earnings Per Share ("EPS") Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Net Income Net Income (Loss) Available to Common Stockholders, Basic Net Income, Basic Net Income (Loss) Available to Common Stockholders, Diluted Net Income, Diluted Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Weighted Average Common Shares Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Effect of Dilutive Securities (in shares) Earnings Per Share, Basic and Diluted [Abstract] Per Common Share Amount The amount per share resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of convertible securities.}{Modified Standard, Period Start, Period End, or Total Labels} Dilutive Securities Earnings Per Share, Effect on Basic Earnings Per Share Effect of Dilutive Securities (in dollars per shares) Fair Value, by Balance Sheet Grouping [Table] Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Inputs Level1 [Member] Quoted Prices in Active Markets (Level 1) Fair Value Inputs Level2 [Member] Significant Observable Inputs (Level 2) Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair value of financial instruments Cash and Cash Equivalents, Fair Value Disclosure Cash and cash equivalents Receivables, Fair Value Disclosure Accounts receivable, net Long-term Debt, Percentage Bearing Variable Interest, Amount Variable rate debt Long-term Debt, Percentage Bearing Fixed Interest, Amount Fixed rate debt Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Segment results Property, Plant and Equipment, Type [Axis] Property Plant And Equipment Type [Domain] Property Plant And Equipment Type [Domain] Represents information pertaining to vessels and other assets. Vessels And Other Assets [Member] Vessels Receivable Type [Axis] Receivable Type [Domain] Receivable [Domain] Trade Accounts Receivable [Member] Eligible Accounts Receivable Assigned to CCF Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Noncurrent Assets [Member] Long-term Assets Restricted Cash and Cash Equivalents [Axis] Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Cash and Cash Equivalents [Domain] Cash [Member] CCF Cash Deposits and Withdrawals Represents the senior unsecured notes of the entity. Senior Unsecured Notes [Member] The Notes Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent event Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated other comprehensive (income) loss related to non-qualified plans attributable to the parent. Accumulated Non Qualified Plans Adjustment Attributable To Parent [Member] Non Qualified Plans Accumulated Translation Adjustment [Member] Foreign Currency Transaction Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Interest Hedge Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Finite Lived Intangible Assets Major Class Name [Domain] Customer Relationships [Member] Customer relationships Asset Class [Axis] Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation By Asset Class [Domain] Asset Class [Domain] Indefinitelived Intangible Assets [Member] Indefinite-lived Intangible Assets [Member] Trade Names [Member] Trade Names Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Selling General And Administrative Expenses [Member] Selling, general and administrative expenses Measurement Basis [Axis] Portion At Fair Value Fair Value Disclosure [Member] Portion at Fair Value Measurement [Member] Carrying Reported Amount Fair Value Disclosure [Member] Carrying value Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value Measurement Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments [Member] Operating segments Intersegment Elimination [Member] Intersegment Eliminations