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Restructuring Charges (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
office
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jan. 31, 2014
vessel
Nov. 30, 2013
vessel
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 26,811 $ 14,017 $ 9,826    
Number of offices closed | office 2        
Number of vessels | vessel         5
Restructuring liability $ 5,600 3,200      
Special Termination Benefits [Member]          
Restructuring Cost and Reserve [Line Items]          
Reimbursement revenue   $ 8,400      
In-Chartered [Member] | Special Termination Benefits [Member]          
Restructuring Cost and Reserve [Line Items]          
Number of vessels | vessel       1