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Schedule of Vessel Commitments (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Sep. 30, 2014
Vessel
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments 32
Total cost, commitments $ 907,911
Invested, commitments 311,353
Remaining Balance, commitments 596,558
Deepwater PSVs
  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction 23
Total cost, under construction 772,194
Invested, under construction 235,138
Remaining Balance, under construction 537,056
Towing Supply Vessels
  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction 6
Total cost, under construction 112,885
Invested, under construction 63,690
Remaining Balance, under construction 49,195
Other
  
Significant Purchase and Supply Commitment [Line Items]  
Number of vessels under construction 1
Total cost, under construction 8,014
Invested, under construction 8,014
Vessel Commitments
  
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments 30
Total cost, commitments 893,093
Invested, commitments 306,842
Remaining Balance, commitments 586,251
Remotely Operated Vehicles Commitments
  
Significant Purchase and Supply Commitment [Line Items]  
Number of Vessels, commitments 2
Total cost, commitments 14,818
Invested, commitments 4,511
Remaining Balance, commitments $ 10,307