Equity Method Investments - Angola Joint Venture - Additional Information (Detail)	12 Months Ended
Dec. 31, 2015 Vessel Option m³
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in joint venture	100.00%
Angola LNG Carriers [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in joint venture	33.00%
Number of vessels \| Vessel	4
Volume of vessels \| m³	160,400
Capital lease arrangement period, lessor	20 years
Number of extension options \| Option	2
Extension option periods	5 years

A general description of the nature of the existing leasing arrangements of a lessor for all types of capital leases (sales-type, direct financing, leveraged) including, but not limited to: (1) unguaranteed residual values, if any, (2) restrictions imposed by lease arrangements; (3) unusual provisions or conditions; (4) contingent rentals, if any; and (5) lease expiration dates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6452767&loc=d3e37045-112695

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45424-112738

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