Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-Term Debt, Gross	$ 3,237,703	$ 3,426,568
Deferred Finance Costs, Net	(54,809)	(62,694)
Total debt	3,182,894	3,363,874
Less current portion	(586,892)	(485,069)
Long-term portion	2,596,002	2,878,805
U.S. Dollar-denominated Revolving Credit Facilities due through 2019
Debt Instrument [Line Items]
Long-Term Debt, Gross	291,764	429,279
Norwegian Kroner Bonds due through 2019
Debt Instrument [Line Items]
Long-Term Debt, Gross	256,927	327,941
U.S. Dollar-denominated Term Loans due through 2018
Debt Instrument [Line Items]
Long-Term Debt, Gross	112,406	129,133
Total debt	112,400
U.S. Dollar-denominated Term Loans due through 2028
Debt Instrument [Line Items]
Long-Term Debt, Gross	2,109,926	2,037,766
U.S. Dollar Non-Public Bonds due through 2024
Debt Instrument [Line Items]
Long-Term Debt, Gross	166,680	202,449
U.S. Dollar Bonds due 2019
Debt Instrument [Line Items]
Long-Term Debt, Gross	$ 300,000	$ 300,000

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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