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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 6 Months Ended
Dec. 31, 2013
Vessel
Sep. 30, 2014
T
Significant Purchase and Supply Commitment [Line Items]    
Number of Vessels, commitments   32
Vessel Commitments
    
Significant Purchase and Supply Commitment [Line Items]    
Number of Vessels, commitments   30
Deepwater PSVs
    
Significant Purchase and Supply Commitment [Line Items]    
Significant commitment, new construction deadweight tons capacity range, low   3,000
Significant commitment, new construction deadweight tons capacity range, high   6,360
Significant commitment, new construction final delivery date   June 2016
Number of vessels took for delivery 2  
Amount held as escrow $ 11.7  
Number of vessels 2  
Number of vessels, sold 1  
Deferred gain amortization period 10 years  
Towing Supply Vessels
    
Significant Purchase and Supply Commitment [Line Items]    
Significant commitment, new construction brake horsepower   7,145
Remotely Operated Vehicles Commitments
    
Significant Purchase and Supply Commitment [Line Items]    
Significant commitment, new construction final delivery date   November of 2014
Number of vessels took for delivery   2
Fast, Crew/Supply Boat
    
Significant Purchase and Supply Commitment [Line Items]    
Number of vessels under construction   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
Committed and invested amount   $ 8.0