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Segment Reporting - Additional Information (Detail)
12 Months Ended
Dec. 31, 2015
Vessel
Segment
Segment Reporting Information [Line Items]  
Number of reportable segments | Segment 2
Liquefied Gas Segment [Member] | Liquefied Natural Gas [Member]  
Segment Reporting Information [Line Items]  
Number of vessels 50
Liquefied Gas Segment [Member] | Liquefied Natural Gas [Member] | Corporate Joint Venture [Member]  
Segment Reporting Information [Line Items]  
Number of vessels 26
Liquefied Gas Segment [Member] | Liquefied Petroleum Gas Multi Gas [Member]  
Segment Reporting Information [Line Items]  
Number of vessels 29
Liquefied Gas Segment [Member] | Liquefied Petroleum Gas [Member] | Corporate Joint Venture [Member]  
Segment Reporting Information [Line Items]  
Number of vessels 23
Conventional Tankers [Member] | Suezmax Tankers [Member]  
Segment Reporting Information [Line Items]  
Number of vessels 7
Conventional Tankers [Member] | Handymax Product [Member]  
Segment Reporting Information [Line Items]  
Number of vessels 1