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 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) loss of 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 Interest expense, net 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) and 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 Total Other Comprehensive Income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income Earnings Per Share, Basic Basic Earnings Per Share (in dollars per share) Net income (in dollars per share) Earnings Per Share, Diluted Diluted Earnings Per Share (in dollars per share) Net income (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) 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 Deferred Tax Assets, Net of Valuation Allowance, Current Deferred income taxes Prepaid Expense and Other Assets, Current Prepaid expenses and other assets Assets, Current Total current assets Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investment in terminal joint venture Property, Plant and Equipment, Net Property and equipment, net Intangible Assets, Net (Including Goodwill) Goodwill and intangible assets, net 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 long-term debt Accounts Payable, Current Accounts payable Employee-related Liabilities, Current Payroll and vacation benefits Self Insurance Reserve, Current Self-insured liabilities Other Liabilities, Current 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 Self-insured claims and other liabilities Liabilities, Noncurrent Total long-term liabilities Commitments and Contingencies. Commitments and Contingencies (Note 7) 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 Provided by 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 Used in 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 Deposits into Capital Construction Fund Deposits into Capital Construction Fund The cash inflow from withdrawals from the capital construction fund to be used for qualified purchases under provisions of Merchant Marine Act, 1936, as amended. Withdrawals from Capital Construction Fund Withdrawals from Capital Construction Fund Payments to Acquire Businesses, Net of Cash Acquired Payments for 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 Used in Financing Activities: Proceeds from Issuance of Long-term Debt Proceeds from issuance of debt Repayments of Debt Repayments of Debt Proceeds from Issuance of Common Stock Proceeds from issuance of capital stock Excess Tax Benefit from Share-based Compensation, Financing Activities Tax Withholding related to net share settlements of restricted stock units Payments of Ordinary Dividends, Common Stock Dividends paid 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 increase in cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations Cash and cash equivalents, end of the year Cash and cash equivalents, beginning of the year Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information: Interest Paid, Net Interest paid 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 Expenditures Incurred but Not yet Paid Capital lease obligations DESCRIPTION OF THE BUSINESS Business Description and Basis of Presentation [Text Block] DESCRIPTION OF THE BUSINESS SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] SIGNIFICANT ACCOUNTING POLICIES CAPITAL CONSTRUCTION FUND Restricted Assets Disclosure [Text Block] CAPITAL CONSTRUCTION FUND 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 CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] CONTINGENCIES EARNINGS PER SHARE ("EPS") Earnings Per Share [Text Block] EARNINGS PER SHARE ("EPS") 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 Schedule of Long-term Debt Instruments [Table Text Block] Schedule of long-term debt Schedule of Net Benefit Costs [Table Text Block] Components of Net Periodic Benefit Cost 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] Reportable Segment results 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 Segment [Member] Investment, Name [Axis] Equity Method Investee Name [Domain] Equity Method Investee Name [Domain] Represents SSA Terminals, LLC (SSAT). Ssa Terminals Llc [Member] Ssa Terminals Llc [Member] Line items represent description about business. Description of Business [Line Items] DESCRIPTION OF THE BUSINESS Equity Method Investment, 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 provides terminal and stevedoring services to Matnav and numerous carriers The cash outflow from making deposits into the capital construction fund to be used for qualified purchases under provisions of Merchant Marine Act, 1936, as amended. Cash Deposits Into Capital Construction Fund Represents the amount of accounts receivable assigned to Capital Contribution Fund during the period. Trade Accounts Receivable Assigned to Capital Construction Fund Eligible accounts receivable assigned to the Capital Construction Fund The amount of accrued deposits from certain qualified earnings to the Capital Construction Fund that are reflected as obligations on the consolidated balance sheets. Accrued Deposits to Capital Construction Fund Eligible accounts receivable assigned to the CCF 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] Term Loans Payable5.79 Percent Through2020 Represents the 3.66 percent term loans payable through 2023. Term Loans Payable3.66 Percent Through2023 [Member] Term Loans Payable3.66 Percent Through2023 Represents the 4.16 percent term loans payable through 2027. Term Loans Payable4.16 Percent Through2027 [Member] Term Loans Payable4.16 Percent Through2027 Represents the 4.31 percent term loans payable through 2032. Term Loans Payable4.31 Percent Through2032 [Member] Term Loans Payable4.31 Percent Through2032 Represents the 4.35 percent term loans payable through 2044. Term Loans Payable4.35 Percent Through2044 [Member] Term Loans Payable4.35 Percent Through2044 Represents the 5.34% secured notes payable through 2028. Secured Bonds Payable5.34 Percent Through2028 [Member] Secured Bonds Payable5.34 Percent Through2028 Represents the 5.27% secured notes payable through 2029. Secured Bonds Payable5.27 Percent Through2029 [Member] Secured Bonds Payable5.27 Percent Through2029 Represents information pertaining to 4.35 percent, payable through 2044. Term Notes Payable4.35 Percent Through2044 [Member] Term Notes Payable4.35 Percent Through2044 Represents the senior unsecured long-term debt of the entity. Senior Unsecured Long Term Debt [Member] Senior Unsecured Long Term Debt Debt Instrument, Redemption, Period [Axis] Debt Instrument Redemption Period [Domain] Debt Instrument Redemption Period [Domain] Debt Instrument Redemption Period One [Member] Debt Instrument Redemption 2021 Debt Instrument Redemption Period Two [Member] Debt Instrument Redemption 2022 and 2023 Debt Instrument Redemption Period Three [Member] Debt Instrument Redemption 2024 to 2027 Debt Instrument Redemption Period Four [Member] Debt Instrument Redemption 2028 Debt Instrument Redemption Period Five [Member] Debt Instrument Redemption 2029 and thereafter until 2044 Debt Instrument [Line Items] Debt Capital Lease Obligations Capital leases Long-term Debt. Long-term Debt, Total Long-term Debt, Current Maturities Less current portion Long-term Debt and Capital Lease Obligations Total long-term debt Debt Instrument, Interest Rate, Stated Percentage Interest rate (as a percent) Debt Instrument, Face Amount Debt issued Debt Instrument, Term Debt instrument term Represents the weighted average period of the tranches of unsecured long-term debt in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Long-term Debt Weighted Average Period Weighted average period Debt Instrument, Annual Principal Payment Annual principal payments Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans [Domain] Defined Benefit Plans [Domain] United States Pension Plans Of U S Entity Defined Benefit [Member] United States Pension Plans Of U S Entity Defined Benefit [Member] Represents non-qualified defined benefit pension plans. Nonqualified Pension Plans [Member] Qualified Pension Plans Represents information pertaining to the non-qualified and post-retirement benefit plans of the entity. Nonqualified And Postretirement Benefit Plans [Member] Postretirement Benefit Plans Defined Benefit Plan Disclosure [Line Items] Pension and Post-retirement Plans Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Components of Net Periodic Benefit Cost 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