Derivative Instruments and Hedging Activities - Location and Fair Value Amounts of Derivative Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other	$ 77,496	$ 38,180
Current Portion of Derivative Liabilities	(12,205)	(80,423)
Derivative Liabilities	(56,352)	(48,388)
Derivative
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other	3,699	1,220
Other Non-Current Assets	17,361	41,147
Accrued Liabilities and Other	(3,191)	(5,664)
Current Portion of Derivative Liabilities	(12,205)	(80,423)
Derivative Liabilities	(56,352)	(48,388)
Derivative \| Derivatives designated as a cash flow hedge \| Interest Rate Swap Agreements
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other	784	0
Other Non-Current Assets	2,362	1,037
Accrued Liabilities and Other	(20)	(18)
Current Portion of Derivative Liabilities	0	(751)
Derivative Liabilities	0	(7)
Derivative \| Derivatives not designated as a cash flow hedge \| Interest Rate Swap Agreements
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other	2,915	1,124
Other Non-Current Assets	2,973	4,319
Accrued Liabilities and Other	(2,498)	(4,836)
Current Portion of Derivative Liabilities	(7,419)	(35,134)
Derivative Liabilities	(32,672)	(38,213)
Derivative \| Derivatives not designated as a cash flow hedge \| Foreign currency contracts
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other	0	96
Other Non-Current Assets	0	0
Accrued Liabilities and Other	0	0
Current Portion of Derivative Liabilities	0	(15)
Derivative Liabilities	0	0
Derivative \| Derivatives not designated as a cash flow hedge \| Cross currency swap agreements
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other	0	0
Other Non-Current Assets	0	5,042
Accrued Liabilities and Other	(713)	(810)
Current Portion of Derivative Liabilities	(4,729)	(44,523)
Derivative Liabilities	(23,680)	(10,168)
Derivative \| Derivatives not designated as a cash flow hedge \| Stock Purchase Warrants
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other	0	0
Other Non-Current Assets	12,026	30,749
Accrued Liabilities and Other	0	0
Current Portion of Derivative Liabilities	0	0
Derivative Liabilities	0	$ 0
Derivative \| Derivatives not designated as a cash flow hedge \| Forward freight agreements
Derivatives, Fair Value [Line Items]
Prepaid Expenses and Other	0
Other Non-Current Assets	0
Accrued Liabilities and Other	0
Current Portion of Derivative Liabilities	(57)
Derivative Liabilities	$ 0

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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Carrying amount as of the balance sheet date of the assets arising from derivative contracts and hedging activities, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

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Fair value, after the effects of master netting arrangements, of a financial liability or 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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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