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Segment Reporting - Segment Reporting Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |
Voyage revenues |  | $ 392,251 | $ 379,975 | $ 374,008
Voyage expenses |  | 1,772 | 1,387 | 2,042
Vessel operating expenses |  | 86,347 | 89,046 | 84,577
Depreciation and amortization |  | 99,825 | 91,919 | 89,347
General and administrative |  | 27,149 | 24,120 | 23,247
Write down of vessels |  | 29,367 |  |
Gain on sale of vessel | (4,300) |  |  | (4,340)
Restructuring charge |  |  |  | 175
Income from vessel operations |  | 147,791 | 173,503 | 178,960
Equity income |  | 78,866 | 20,584 | 8,043
Investment in and advances to equity accounted joint ventures |  | 409,735 | 191,448 |
Total assets |  | 3,638,761 | 3,464,348 |
Expenditures for vessels and equipment |  | 39,894 | 64,685 | 26,652
Expenditures for dry docking |  | 7,493 | 19,638 | 12,727
Liquefied Gas Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Voyage revenues |  | 278,511 | 269,408 | 264,816
Voyage expenses |  | 66 | (87) | 29
Vessel operating expenses |  | 45,816 | 47,773 | 46,496
Depreciation and amortization |  | 69,064 | 62,889 | 60,954
General and administrative |  | 17,532 | 13,385 | 12,239
Gain on sale of vessel |  |  |  | (4,340)
Income from vessel operations |  | 146,033 | 145,448 | 149,438
Equity income |  | 78,866 | 20,584 | 8,043
Investment in and advances to equity accounted joint ventures |  | 409,735 | 191,448 |
Total assets |  | 3,143,205 | 2,911,659 |
Expenditures for vessels and equipment |  | 39,366 | 63,686 | 24,095
Expenditures for dry docking |  | 6,054 | 13,831 | 2,014
Conventional Tanker Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Voyage revenues |  | 113,740 | 110,567 | 109,192
Voyage expenses |  | 1,706 | 1,474 | 2,013
Vessel operating expenses |  | 40,531 | 41,273 | 38,081
Depreciation and amortization |  | 30,761 | 29,030 | 28,393
General and administrative |  | 9,617 | 10,735 | 11,008
Write down of vessels |  | 29,367 |  |
Restructuring charge |  |  |  | 175
Income from vessel operations |  | 1,758 | 28,055 | 29,522
Total assets |  | 495,556 | 552,689 |
Expenditures for vessels and equipment |  | 528 | 999 | 2,557
Expenditures for dry docking |  | $ 1,439 | $ 5,807 | $ 10,713

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