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Segment Reporting - Reconciliation of Total Segment Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]        
Total assets $ 3,910,923 $ 3,760,454    
Cash and cash equivalents 102,481 159,639 $ 139,481 $ 113,577
Accounts receivable and prepaid expenses 26,550 15,240    
Advances to affiliates 13,026 11,942    
Consolidated total assets 4,052,980 3,947,275    
Liquefied Gas Segment [Member]        
Segment Reporting Information [Line Items]        
Total assets 3,550,396 3,379,279    
Conventional Tankers [Member]        
Segment Reporting Information [Line Items]        
Total assets $ 360,527 $ 381,175