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Schedule of Vessel Commitments (Detail) - Jun. 30, 2015 $ in Thousands | USD ($) Vessel
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Significant Purchase and Supply Commitment [Line Items] |
Number of Vessels, commitments | Vessel | 16
Vessel Commitments |
Significant Purchase and Supply Commitment [Line Items] |
Number of Vessels, commitments | Vessel | 16
Total cost, commitments | $ 490,125
Invested, commitments | 266,824
Remaining Balance, commitments | $ 223,301
Deepwater PSVs |
Significant Purchase and Supply Commitment [Line Items] |
Number of vessels under construction | Vessel | 13
Total cost, under construction | $ 439,109
Invested, under construction | 227,291
Remaining Balance, under construction | $ 211,818
Towing Supply Vessels |
Significant Purchase and Supply Commitment [Line Items] |
Number of vessels under construction | Vessel | 3
Total cost, under construction | $ 51,016
Invested, under construction | 39,533
Remaining Balance, under construction | $ 11,483

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