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 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 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 Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment 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 Finite-Lived Intangible Assets, Net Intangible assets, net The amount on deposit in the Capital Construction Fund invested in a money market fund, reflected in the consolidated balance sheets. Net Balance of Amounts Accrued for Capital Construction Fund 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 benefits 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 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 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 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 Proceeds from Sale of Productive Assets Proceeds from disposal of property and equipment The cash outflow from making deposits and accounts receivable assigned into the capital construction fund to be used for qualified purchases under provisions of Merchant Marine Act, 1936, as amended. Deposits into Capital Construction Fund Cash deposits into Capital Construction Fund Decrease in Restricted Cash Withdrawals from Capital Construction Fund 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: Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefit from stock-based compensation 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 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) Increase 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 Income Taxes Paid, Net Income tax (refund) 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 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 POST-RETIREMENT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] PENSION AND 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, 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 Commitments and Contingencies, Policy [Policy Text Block] Contingencies 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 Business Acquisitions, by Acquisition [Table Text Block] Schedule of total consideration paid for the Horizon Acquisition on effective date of May 29, 2015 Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Summary of estimated fair values assigned to Horizon's assets acquired and liabilities assumed as a result of the Horizon Acquisition as of March 31, 2016 and December 31, 2015 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 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 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 CAPITAL CONSTRUCTION FUND. Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation of property and equipment Finite-Lived Intangible Assets, Accumulated Amortization Accumulated amortization of intangible assets Other Assets CCF Balance Increase in Restricted Cash Cash Deposits Into CCF Reductions in Other Assets, Amount Qualified withdrawals from CCF Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition Acquiree [Domain] Business Acquisition Acquiree [Domain] Represents information pertaining to Horizon Lines, Inc. Horizon Lines Inc [Member] Horizon Business Acquisition [Line Items] Business acquisition Business Acquisition, Share Price Cash price (in dollars per share) Business Combination, Consideration Transferred [Abstract] Total cash consideration 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 Business Combination, Consideration Transferred, Liabilities Incurred Horizon's debt (including accrued interest and breakage fees) Business Combination, Consideration Transferred Total 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 Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent Deferred tax assets, net 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, Other Noncurrent Assets Other long-term assets 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