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Fair Value Measurements - Fair Value of Financial Instruments and Other Non-Financial Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents and restricted cash | $ 456,325 | $ 505,639 | $ 552,174 | $ 805,242
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 202 |  |  |
Derivative Liability, Current | 39,263 | 12,205 |  |
Assets Held-for-sale, Not Part of Disposal Group, Current | 65,458 | 0 |  |
Short-term Debt | 50,000 | 0 |  |
Loans to equity-accounted investees | 8,241 | 169,197 |  |
Long-term debt – non-public (note 9) | (2,827,152) | (3,319,523) |  |
Finance Lease, Liability | 1,825,692 | 1,673,845 |  |
Recurring | Level 3 | Stock Purchase Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Stock purchase warrants | 0 | 12,026 | $ 30,749 |
Carrying Amount Asset (Liability) | Recurring | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents and restricted cash | 454,867 | 505,639 |  |
Carrying Amount Asset (Liability) | Recurring | Level 2 | Cross Currency Interest Swap Agreement |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate swap agreements - assets | 0 | 0 |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 42,104 | 29,122 |  |
Carrying Amount Asset (Liability) | Recurring | Level 2 | Foreign Currency Contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cross currency interest swap agreement and foreign currency contracts | 202 | 0 |  |
Carrying Amount Asset (Liability) | Recurring | Level 2 | Forward freight agreements |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative Asset, Current | (86) |  |  |
Derivative Liability, Current |  | (57) |  |
Carrying Amount Asset (Liability) | Recurring | Level 3 | Stock Purchase Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Stock purchase warrants | 0 | 12,026 |  |
Carrying Amount Asset (Liability) | Non-recurring | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group, Current | 37,240 | 0 |  |
Fair Value Asset (Liability) | Recurring | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash, cash equivalents and restricted cash | 454,867 | 505,639 |  |
Fair Value Asset (Liability) | Recurring | Level 2 | Cross Currency Interest Swap Agreement |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate swap agreements - assets | 0 | 0 |  |
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value | 42,104 | 29,122 |  |
Fair Value Asset (Liability) | Recurring | Level 2 | Foreign Currency Contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cross currency interest swap agreement and foreign currency contracts | 202 | 0 |  |
Fair Value Asset (Liability) | Recurring | Level 2 | Forward freight agreements |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative Asset, Current | (86) |  |  |
Derivative Liability, Current |  | (57) |  |
Fair Value Asset (Liability) | Recurring | Level 3 | Stock Purchase Warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Stock purchase warrants | 0 | 12,026 |  |
Fair Value Asset (Liability) | Non-recurring | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group, Current | 37,240 | 0 |  |
Interest Rate Swap Agreements | Carrying Amount Asset (Liability) | Recurring | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative Asset | 3,099 | 9,640 |  |
Freight forward agreements | (52,453) | (43,175) |  |
Interest Rate Swap Agreements | Fair Value Asset (Liability) | Recurring | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative Asset | 3,099 | 9,640 |  |
Freight forward agreements | (52,453) | (43,175) |  |
Public [Member] | Carrying Amount Asset (Liability) | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt – non-public (note 9) | (619,794) | (856,986) |  |
Public [Member] | Fair Value Asset (Liability) | Level 1 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt – non-public (note 9) | (655,977) | (851,470) |  |
Private [Member] | Carrying Amount Asset (Liability) | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Short-term Debt | 50,000 | 0 |  |
Long-term debt – non-public (note 9) | (2,207,358) | (2,462,537) |  |
Finance Lease, Liability | 1,825,692 | 1,673,845 |  |
Private [Member] | Fair Value Asset (Liability) | Level 2 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Short-term Debt, Fair Value | (50,000) | 0 |  |
Long-term debt – non-public (note 9) | (2,180,440) | (2,395,300) |  |
Finance Lease, Liability | $ 1,877,558 | $ 1,652,345 |  |

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