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Equity Method Investments - Financial Information of Joint Ventures (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |
Vessels and equipment | $ 2,108,160 | $ 1,989,230 |
Net investments in direct financing leases - non-current | 666,658 | 682,495 |
Other assets - non-current | 20,811 | 27,536 |
Other liabilities - non-current | 71,152 | 74,734 |
Voyage revenues | 397,991 | 402,928 | $ 399,276
Income from vessel operations | 181,372 | 183,823 | 176,356
Net income | 217,510 | 218,927 | 213,315
Equity Method Investments [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Cash and restricted cash | 281,943 | 287,207 |
Other assets - current | 77,861 | 137,055 |
Vessels and equipment | 2,343,397 | 2,243,381 |
Net investments in direct financing leases - non-current | 1,813,991 | 1,850,279 |
Other assets - non-current | 22,120 | 14,515 |
Current portion of long-term debt and obligations under capital lease | 166,522 | 435,272 |
Other liabilities - current | 97,405 | 125,787 |
Long-term debt and obligations under capital lease | 2,583,721 | 2,321,562 |
Other liabilities - non-current | 381,213 | 390,467 |
Voyage revenues | 596,093 | 640,105 | 625,414
Income from vessel operations | 302,731 | 398,836 | 335,062
Realized and unrealized (loss) gain on derivative instruments | (25,108) | (52,938) | 16,334
Net income | $ 203,280 | $ 267,990 | $ 277,096

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