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Segment Reporting - Segment Reporting Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Voyage revenues $ 397,991 $ 402,928 $ 399,276
Voyage recoveries (expenses) (1,146) (3,321) (2,857)
Vessel operating expenses (94,101) (95,808) (99,949)
Depreciation and amortization (92,253) (94,127) (97,884)
General and administrative expenses (25,118) (23,860) (20,444)
Restructuring charge (4,001) (1,989) (1,786)
Income from vessel operations 181,372 183,823 176,356
Equity income 84,171 115,478 123,282
Investment in and advances to equity accounted joint ventures 883,731 891,478  
Total assets 3,910,923 3,760,454  
Expenditures for vessels and equipment (191,969) (194,255) (470,213)
Expenditures for dry docking (10,357) (13,471) (27,203)
Liquefied Gas Segment [Member]      
Segment Reporting Information [Line Items]      
Voyage revenues 305,056 307,426 285,694
Voyage recoveries (expenses) 203 (1,768) (407)
Vessel operating expenses (63,344) (59,087) (55,459)
Depreciation and amortization (71,323) (71,711) (71,485)
General and administrative expenses (19,392) (17,992) (13,913)
Income from vessel operations 151,200 156,868 144,430
Equity income 84,171 115,478 123,282
Investment in and advances to equity accounted joint ventures 883,731 891,478  
Total assets 3,550,396 3,379,279  
Expenditures for vessels and equipment (191,642) (193,669) (469,463)
Expenditures for dry docking (8,659) (8,127) (21,090)
Conventional Tankers [Member]      
Segment Reporting Information [Line Items]      
Voyage revenues 92,935 95,502 113,582
Voyage recoveries (expenses) (1,349) (1,553) (2,450)
Vessel operating expenses (30,757) (36,721) (44,490)
Depreciation and amortization (20,930) (22,416) (26,399)
General and administrative expenses (5,726) (5,868) (6,531)
Restructuring charge (4,001) (1,989) (1,786)
Income from vessel operations 30,172 26,955 31,926
Total assets 360,527 381,175  
Expenditures for vessels and equipment (327) (586) (750)
Expenditures for dry docking $ (1,698) $ (5,344) $ (6,113)