Financial Instruments - Fair Value of Financial Instruments and Other Non-Financial Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stock purchase warrants	$ 4,189	$ 17,844
Loans to equity-accounted investees and joint venture partners - Long-term	191,271	184,390
Long-term debt	(7,000,637)	(7,384,086)
Carrying Amount Asset (Liability) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans to equity-accounted investees and joint venture partners - Current	17,740	7,127
Loans to equity-accounted investees and joint venture partners - Long-term	191,271	184,390
Carrying Amount Asset (Liability) [Member] \| Level 1 [Member] \| Public [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	(1,471,093)	(1,493,915)
Carrying Amount Asset (Liability) [Member] \| Level 2 [Member] \| Private [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	(5,529,544)	(5,890,171)
Carrying Amount Asset (Liability) [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivable included in accounts receivable and other assets	14,406	16,453
Carrying Amount Asset (Liability) [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, restricted cash, and marketable securities	933,034	855,107
Carrying Amount Asset (Liability) [Member] \| Recurring [Member] \| Level 2 [Member] \| Interest rate swap agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements - assets	2,122	6,136
Interest rate swap agreements - liabilities	(521,617)	(370,952)
Carrying Amount Asset (Liability) [Member] \| Recurring [Member] \| Level 2 [Member] \| Cross currency swap agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cross currency interest swap agreement	(258,568)	(312,110)
Carrying Amount Asset (Liability) [Member] \| Recurring [Member] \| Level 2 [Member] \| Foreign currency contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cross currency interest swap agreement	(3,762)	(18,826)
Carrying Amount Asset (Liability) [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Logitel contingent consideration (see below)	0	(14,830)
Carrying Amount Asset (Liability) [Member] \| Recurring [Member] \| Level 3 [Member] \| Warrant [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stock purchase warrants	1,833	10,328
Carrying Amount Asset (Liability) [Member] \| Recurring [Member] \| Level 3 [Member] \| Time-charter Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time charter swap agreement	1,345	0
Carrying Amount Asset (Liability) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Vessels and equipment	0	100,600
Vessels held for sale (note 7)	75,562	55,450
Fair Value Asset (Liability) [Member] \| Level 1 [Member] \| Public [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	(1,299,169)	(1,161,729)
Fair Value Asset (Liability) [Member] \| Level 2 [Member] \| Private [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	(5,383,777)	(5,881,483)
Fair Value Asset (Liability) [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivable included in accounts receivable and other assets	14,366	16,427
Fair Value Asset (Liability) [Member] \| Recurring [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, restricted cash, and marketable securities	933,034	855,107
Fair Value Asset (Liability) [Member] \| Recurring [Member] \| Level 2 [Member] \| Interest rate swap agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements - assets	2,122	6,136
Interest rate swap agreements - liabilities	(521,617)	(370,952)
Fair Value Asset (Liability) [Member] \| Recurring [Member] \| Level 2 [Member] \| Cross currency swap agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cross currency interest swap agreement	(258,568)	(312,110)
Fair Value Asset (Liability) [Member] \| Recurring [Member] \| Level 2 [Member] \| Foreign currency contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cross currency interest swap agreement	(3,762)	(18,826)
Fair Value Asset (Liability) [Member] \| Recurring [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Logitel contingent consideration (see below)	0	(14,830)
Fair Value Asset (Liability) [Member] \| Recurring [Member] \| Level 3 [Member] \| Warrant [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stock purchase warrants	1,833	10,328
Fair Value Asset (Liability) [Member] \| Recurring [Member] \| Level 3 [Member] \| Time-charter Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Time charter swap agreement	1,345	0
Fair Value Asset (Liability) [Member] \| Fair Value, Measurements, Nonrecurring [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Vessels and equipment	0	100,600
Vessels held for sale (note 7)	$ 75,562	55,450
BG Joint Venture [Member] \| Supply Commitment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate	8.00%
BG Joint Venture [Member] \| Supply Commitment [Member] \| Fair Value Asset (Liability) [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivable included in accounts receivable and other assets	$ 14,400	16,400
Accrued Liabilities [Member] \| Interest rate swap agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest	$ 18,100	$ 21,700

Fair value portion of accrued expenses.

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Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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No definition available.

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Fair value as of the balance sheet date of all derivative assets not designated as hedging instruments.

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Fair value as of the balance sheet date of all derivative liabilities not designated as hedging instruments.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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