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Schedule of Vessel Commitments (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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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

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