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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)

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