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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%