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Equity Method Investments - Financial Information of Joint Ventures (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Equity Method Investments [Line Items] |  |  |
Vessels and equipment | $ 1,949,640 | $ 2,021,125 |
Net investments in direct financing leases - non-current | 403,386 | 409,541 |
Current portion of long-term debt | 86,489 | 84,722 |
Long-term debt | 1,413,353 | 1,315,231 |
Other liabilities - non-current | 73,568 | 76,096 |
Voyage revenues | 392,251 | 379,975 | 374,008
Income from vessel operations | 147,791 | 173,503 | 178,960
Realized and unrealized loss on derivative instruments | (29,620) | (63,030) | (78,720)
Net income | 139,142 | 97,356 | 92,944
Equity method investments [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Cash and restricted cash | 155,943 | 94,508 |
Other assets - current | 57,868 | 34,100 |
Vessels and equipment | 1,653,273 | 226,794 |
Net investments in direct financing leases - non-current | 1,938,011 | 1,728,702 |
Other assets - non-current | 180,898 | 165,912 |
Current portion of long-term debt | 1,075,853 | 71,073 |
Other liabilities - current | 122,702 | 69,826 |
Long-term debt | 1,603,118 | 1,483,675 |
Other liabilities - non-current | 446,733 | 315,271 |
Voyage revenues | 412,974 | 167,094 | 106,371
Income from vessel operations | 278,067 | 124,553 | 83,992
Realized and unrealized loss on derivative instruments | (39,428) | (41,622) | (35,173)
Net income | $ 180,059 | $ 51,492 | $ 20,092

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