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Segment Reporting - Revenues and Percentage of Consolidated Voyage Revenues from Top Customers (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Voyage revenues from major customers	$ 397,991	$ 402,928	$ 399,276
Ras Laffan Liquefied Natural Gas Company Ltd. [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Voyage revenues from major customers	70,100	69,800	69,700
Shell Spain LNG S.A.U [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Voyage revenues from major customers	48,500	51,800	53,500
The Tangguh Production Sharing Contractors [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Voyage revenues from major customers	$ 44,900	$ 44,300	$ 47,300
Sales Revenue, Net [Member] | Ras Laffan Liquefied Natural Gas Company Ltd. [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Percentage of voyage revenues from major customers	18.00%	17.00%	17.00%
Sales Revenue, Net [Member] | Shell Spain LNG S.A.U [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Percentage of voyage revenues from major customers	12.00%	13.00%	13.00%
Sales Revenue, Net [Member] | The Tangguh Production Sharing Contractors [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Percentage of voyage revenues from major customers	11.00%	11.00%	12.00%

X

- Definition

Revenue from transporting cargo and freight between locations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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