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Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Non-current assets and total assets $ 4,052,980 $ 3,947,275
Current portion of long-term debt and current liabilities 197,197 157,088
Long-term debt 1,802,012 1,749,893
Total Liabilities 2,509,301 2,399,904
Other assets - non-current 20,811 27,536
Vessels and equipment 2,108,160 1,989,230
Net investments in direct financing leases - non-current 666,658 682,495
Equity Method Investments [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets - non-current 22,120 14,515
Vessels and equipment 2,343,397 2,243,381
Net investments in direct financing leases - non-current 1,813,991 1,850,279
Current portion of long-term debt and obligations under capital lease 166,522 435,272
Long-term debt and obligations under capital lease 2,583,721 2,321,562
Accounting Standards Update 2015-03 [Member] | Reclassification Adjustment [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Non-current assets and total assets (16,300) (17,100)
Current portion of long-term debt and current liabilities (1,100) (100)
Long-term debt (15,200) (17,000)
Total Liabilities (16,300) (17,100)
Accounting Standards Update 2015-03 [Member] | Reclassification Adjustment [Member] | Equity Method Investments [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Other assets - non-current (60,800) (17,800)
Vessels and equipment   (15,800)
Net investments in direct financing leases - non-current   (23,500)
Current portion of long-term debt and obligations under capital lease (5,000) (5,000)
Long-term debt and obligations under capital lease $ (55,800) $ (52,100)