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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