Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total principal	$ 3,449,611	$ 6,730,132
Less unamortized discount and debt issuance costs	(31,906)	(90,586)
Total debt	3,417,705	6,639,546
Less current portion	(800,897)	(998,591)
Long-term portion	2,616,808	5,640,955
Senior Notes (8.5%) due January 15, 2020
Debt Instrument [Line Items]
Total principal	592,657	592,657
Norwegian Kroner-denominated Bonds due through October 2021
Debt Instrument [Line Items]
Total principal	377,856	628,257
U.S. Dollar-denominated Term Loans due through 2031
Debt Instrument [Line Items]
Total principal	1,358,798	3,702,997
U.S. Dollar Bonds due through 2024
Debt Instrument [Line Items]
Total principal	0	466,680
Euro-denominated Term Loans due through 2023
Debt Instrument [Line Items]
Total principal	232,957	219,733
Other U.S. Dollar-denominated loan
Debt Instrument [Line Items]
Total principal	10,000	0
Revolving Credit Facilities
Debt Instrument [Line Items]
Total principal	$ 877,343	$ 1,119,808

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
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-Topic 835
-SubTopic 30
-Section 45
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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