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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended
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Dec. 31, 2013 Vessel | Sep. 30, 2014 T
Significant Purchase and Supply Commitment [Line Items] |  |
Number of Vessels, commitments |  | 32
Vessel Commitments |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of Vessels, commitments |  | 30
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
Significant commitment, new construction final delivery date |  | June 2016
Number of vessels took for delivery | 2 |
Amount held as escrow | $ 11.7 |
Number of vessels | 2 |
Number of vessels, sold | 1 |
Deferred gain amortization period | 10 years |
Towing Supply Vessels |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Significant commitment, new construction brake horsepower |  | 7,145
Remotely Operated Vehicles Commitments |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Significant commitment, new construction final delivery date |  | November of 2014
Number of vessels took for delivery |  | 2
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

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- Definition Commitments And Contingencies Carrying Value Of Accumulated Costs + References No definition available. + Details
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- Definition Commitments And Contingencies Percentage Of Third Party Credit + References No definition available. + Details
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- Definition Deferred Related Gain Amortization Period + References No definition available. + Details
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- Definition Funded Investment Commitments + References No definition available. + Details
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Balance Type: | debit
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- Definition Number of Vessels + References No definition available. + Details
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- Definition Number of Vessels Sold + References No definition available. + Details
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- Definition Significant commitment, new construction brake horsepower. + References No definition available. + Details
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- Definition Significant Commitment New Construction Dead Weight Tons Capacity Range High + References No definition available. + Details
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- Definition Significant Commitment New Construction Dead Weight Tons Capacity Range Low + References No definition available. + Details
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- Definition Significant Commitment Number Of Vessel + References No definition available. + Details
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- Definition Significant commitment projected delivery date range. + References No definition available. + Details
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- Definition Significant Commitments, New Construction + References No definition available. + Details
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- Definition Significant Delivery Commitment Number Of Vessels + References No definition available. + Details
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- Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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