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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Vessel
May. 31, 2015
USD ($)
Vessel
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Vessel
T
W
Mar. 31, 2015
USD ($)
Significant Purchase and Supply Commitment [Line Items]          
Number of Vessels, commitments | Vessel       9  
Towing Supply Vessels          
Significant Purchase and Supply Commitment [Line Items]          
Significant commitment, new construction brake horsepower | W       7,145  
Number of vessels under construction | Vessel [1]       1  
Aggregate installment payment [1]       $ 13,331  
Deepwater PSVs          
Significant Purchase and Supply Commitment [Line Items]          
Significant commitment, new construction deadweight tons capacity range, low | T       4,200  
Significant commitment, new construction deadweight tons capacity range, high | T       6,000  
Significant commitment, new construction final delivery date       February 2017  
Number of vessels under construction | Vessel   2   8 [1]  
Aggregate installment payment   $ 5,400   $ 213,280 [1] $ 1,000
Significant commitment, new construction delivery date   Jun. 30, 2016      
Obligation to be relieved   $ 21,700      
Vessels Under Construction          
Significant Purchase and Supply Commitment [Line Items]          
Number of vessels under construction | Vessel 6        
Aggregate installment payment $ 36,000   $ 36,000 29,000  
Installment payment returned 24,000   24,000    
Accrued interest owing on the returned installments $ 3,500   3,500 3,700  
Impairment charge on amounts not recoverable     $ 800    
Remaining construction payments       $ 75,000  
Fast, Crew/Supply Boat          
Significant Purchase and Supply Commitment [Line Items]          
Number of vessels under construction | Vessel       1  
Impairment charge on amounts not recoverable       $ 2,400  
Insurance coverage for the progress payments made on the vessel by the third party credit support       90.00%  
Insurance coverage by the third party credit support for the carrying value of the accumulated costs       $ 2,400  
Fast, Crew/Supply Boat | Reclassification of Construction in Progress to Other Non-Current Assets          
Significant Purchase and Supply Commitment [Line Items]          
Committed and invested amount, remaining       $ 5,600  
[1] Seven vessels under option agreements are not included in the table above.