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Schedule of Vessel Commitments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Jun. 30, 2014 Vessel
Significant Purchase and Supply Commitment [Line Items] |
Number of Vessels, commitments | 35
Total cost, commitments | $ 982,921
Invested, commitments | 297,948
Remaining Balance, commitments | 684,973
Deepwater PSVs |
Significant Purchase and Supply Commitment [Line Items] |
Number of vessels under construction | 26
Total cost, under construction | 843,784
Invested, under construction | 230,331
Remaining Balance, under construction | 613,453
Towing Supply Vessels |
Significant Purchase and Supply Commitment [Line Items] |
Number of vessels under construction | 6
Total cost, under construction | 116,143
Invested, under construction | 55,909
Remaining Balance, under construction | 60,234
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 | 33
Total cost, commitments | 967,941
Invested, commitments | 294,254
Remaining Balance, commitments | 673,687
Remotely Operated Vehicles Commitments |
Significant Purchase and Supply Commitment [Line Items] |
Number of Vessels, commitments | 2
Total cost, commitments | 14,980
Invested, commitments | 3,694
Remaining Balance, commitments | $ 11,286

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