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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2013
Vessel
Mar. 31, 2014
Vessel
T
Significant Purchase and Supply Commitment [Line Items]    
Cash compensation on termination of employment, maximum   $ 34.3
Significant commitment, new construction final delivery date   June 2016
Towing Supply Vessels
    
Significant Purchase and Supply Commitment [Line Items]    
Significant commitment, new construction brake horsepower   7,145
Number of vessels under construction   6
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
Number of vessels under construction   23
Number of vessels took for delivery 2  
Amount held as escrow 11.7  
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