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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
 1 Months Ended 3 Months Ended
May. 31, 2015
USD ($)
Vessel
Apr. 30, 2015
USD ($)
Vessel
Jun. 30, 2015
USD ($)
Vessel
T
W
Jul. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Significant Purchase and Supply Commitment [Line Items]          
Number of Vessels, commitments | Vessel     16    
Vessels Under Construction          
Significant Purchase and Supply Commitment [Line Items]          
Number of Vessels, commitments | Vessel   6      
Number of terminated contracts | Vessel   3      
Aggregate installment payment   $ 36.1     $ 0.8
Aggregate estimated remaining cost   $ 12.7      
Accrued interest owing on the returned installments     $ 3.5    
Installment payment returned     24.2    
Impairment charge on amounts not recoverable     $ 0.8    
Subsequent Event | Vessels Under Construction          
Significant Purchase and Supply Commitment [Line Items]          
Installment payment returned       $ 12.0  
Towing Supply Vessels          
Significant Purchase and Supply Commitment [Line Items]          
Significant commitment, new construction brake horsepower | W     7,145    
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     April 2017    
Aggregate installment payment $ 5.4       $ 1.0
Number of vessels under construction | Vessel 2        
Significant commitment, new construction delivery date Jun. 30, 2016        
Obligation to be relieved $ 21.7        
Fast, Crew/Supply Boat          
Significant Purchase and Supply Commitment [Line Items]          
Impairment charge on amounts not recoverable     $ 2.4    
Number of vessels under construction | Vessel     1    
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     $ 2.4    
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     $ 5.6