Financial Instruments - Estimated Fair Value of Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative instruments
Vessels held for sale (notes 4a and 19)	$ 6,900	$ 55,450
Other:
Long-term debt	(3,182,894)	(3,363,874)
Interest Rate Swaps [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(203,106)
Cross Currency Swaps Agreements [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(137,379)
Foreign currency forward contracts [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(1,786)
Carrying Amount [Member] \| Level 1 [Member] \| Recurring [Member]
Recurring:
Cash and cash equivalents and restricted cash	342,287	318,993
Carrying Amount [Member] \| Level 3 [Member] \| Recurring [Member] \| Logitel Offshore Holding [Member]
Recurring:
Contingent consideration	0	(14,830)
Carrying Amount [Member] \| Level 2 [Member] \| Recurring [Member] \| Interest Rate Swaps [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(203,106)	(235,998)
Carrying Amount [Member] \| Level 2 [Member] \| Recurring [Member] \| Cross Currency Swaps Agreements [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(137,379)	(183,327)
Carrying Amount [Member] \| Level 2 [Member] \| Recurring [Member] \| Foreign currency forward contracts [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(1,786)	(11,509)
Carrying Amount [Member] \| Level 2 [Member] \| Non-Recurring [Member]
Derivative instruments
Vessels held for sale (notes 4a and 19)	6,900	55,450
Non-Recurring:
Vessels and equipment	11,300	100,600
Fair Value [Member] \| Level 1 [Member] \| Recurring [Member]
Recurring:
Cash and cash equivalents and restricted cash	342,287	318,993
Fair Value [Member] \| Level 3 [Member] \| Recurring [Member] \| Logitel Offshore Holding [Member]
Recurring:
Contingent consideration	0	(14,830)
Fair Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Interest Rate Swaps [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(203,106)	(235,998)
Fair Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Cross Currency Swaps Agreements [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(137,379)	(183,327)
Fair Value [Member] \| Level 2 [Member] \| Recurring [Member] \| Foreign currency forward contracts [Member]
Derivative instruments
Fair Value / Carrying Amount of Assets (Liability)	(1,786)	(11,509)
Fair Value [Member] \| Level 2 [Member] \| Non-Recurring [Member]
Derivative instruments
Vessels held for sale (notes 4a and 19)	6,900	55,450
Non-Recurring:
Vessels and equipment	11,300	100,600
Public [Member] \| Carrying Amount [Member] \| Level 1 [Member]
Other:
Long-term debt	(550,525)	(620,746)
Public [Member] \| Fair Value [Member] \| Level 1 [Member]
Other:
Long-term debt	(480,710)	(473,729)
Private [Member] \| Carrying Amount [Member] \| Level 2 [Member]
Other:
Long-term debt	(2,632,369)	(2,743,128)
Private [Member] \| Fair Value [Member] \| Level 2 [Member]
Other:
Long-term debt	$ (2,551,697)	$ (2,783,597)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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