Fair value portion of assets classified as held for sale.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets excluding assets held under lease agreements used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Fair Value Measurements - Fair Value of Financial Instruments and Other Non-Financial Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	$ 405,890	$ 456,325	$ 505,639	$ 552,174
Vessels and equipment	2,325,097	2,654,466
Operating Lease, Right-of-Use Asset	52,961	159,638
Other (2)
Short-term Debt	10,000	50,000
Long-term Debt	(2,055,107)	(2,827,152)
Finance Lease, Liability	1,700,965	1,825,692
Derivative Liability, Current	(58,186)	(39,263)
Accrued Liabilities \| Accrued interest
Other (2)
Derivative Liability, Current	(6,100)	3,400
Level 2 \| Carrying Amount Asset (Liability)
Other (2)
Short-term Debt	10,000	50,000
Finance Lease, Liability	1,700,965	1,825,692
Level 2 \| Fair Value Asset (Liability)
Other (2)
Short-term Debt, Fair Value	(10,000)	(50,000)
Finance Lease, Liability	1,868,667	1,877,558
Recurring \| Level 1 \| Carrying Amount Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	405,890	454,867
Recurring \| Level 1 \| Fair Value Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	405,890	454,867
Recurring \| Level 2 \| Interest Rate Swap Agreements \| Carrying Amount Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	3,099
Derivative Liability	(77,873)	(52,453)
Recurring \| Level 2 \| Interest Rate Swap Agreements \| Fair Value Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	3,099
Derivative Liability	(77,873)	(52,453)
Recurring \| Level 2 \| Cross Currency Interest Swap Agreement \| Carrying Amount Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	4,505	0
Derivative Liability	(20,022)	(42,104)
Recurring \| Level 2 \| Cross Currency Interest Swap Agreement \| Fair Value Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	4,505	0
Derivative Liability	(20,022)	(42,104)
Recurring \| Level 2 \| Foreign Currency Contracts \| Carrying Amount Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	0	202
Recurring \| Level 2 \| Foreign Currency Contracts \| Fair Value Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	0	202
Recurring \| Level 2 \| Forward freight agreements \| Carrying Amount Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	0	86
Recurring \| Level 2 \| Forward freight agreements \| Fair Value Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Liability	0	86
Non-recurring \| Level 2 \| Carrying Amount Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Vessels and equipment	99,967	0
Assets Held-for-sale, Long Lived, Fair Value Disclosure	31,680	37,240
Operating Lease, Right-of-Use Asset	1,799	0
Non-recurring \| Level 2 \| Fair Value Asset (Liability)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Vessels and equipment	99,967	0
Assets Held-for-sale, Long Lived, Fair Value Disclosure	31,680	37,240
Operating Lease, Right-of-Use Asset	1,799	0
Public [Member] \| Level 1 \| Carrying Amount Asset (Liability)
Other (2)
Long-term Debt	(587,913)	(619,794)
Public [Member] \| Level 1 \| Fair Value Asset (Liability)
Other (2)
Long-term Debt, Fair Value	597,281	655,977
Private [Member] \| Level 2 \| Carrying Amount Asset (Liability)
Other (2)
Long-term Debt	(1,467,194)	(2,207,358)
Private [Member] \| Level 2 \| Fair Value Asset (Liability)
Other (2)
Long-term Debt, Fair Value	$ 1,481,093	$ 2,180,440