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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | Jul. 31, 2015 USD ($) | Jun. 30, 2015 Vessel | May. 31, 2015 USD ($) Vessel | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Vessel hp T | Sep. 30, 2015 USD ($) | Mar. 31, 2015 USD ($)
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Vessels, commitments | Vessel |  |  |  |  |  |  | 9 |  |  |
Refunds from cancelled vessel construction contracts |  |  |  |  |  |  | $ 36,190 |  |  |
Accrued interest owing on the returned installments |  |  |  |  |  |  |  |  | $ 3,700 |
Refunds from cancelled vessel construction contracts |  |  |  |  |  |  | $ 43,000 |  | 31,000 |
Relieved obligation |  |  |  |  |  |  |  |  | $ 75,000 |
Fast, Crew/Supply Boat |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | Vessel |  |  |  |  |  |  | 1 |  |  |
Impairment charge on amounts not recoverable |  |  |  |  |  |  | $ 2,400 |  |  |
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 |  |  |  |  |  |  | $ 2,400 |  |  |
Fast, Crew/Supply Boat | Reclassification of Construction in Progress to Other Non-Current Assets |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Committed and invested amount, remaining |  |  |  |  |  |  | $ 5,600 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Refunds from cancelled vessel construction contracts |  | $ 12,000 |  |  |  |  |  |  |  |
Deepwater PSVs |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Significant commitment, new construction deadweight tons capacity range, low | T |  |  |  |  |  |  | 4,200 |  |  |
Significant commitment, new construction deadweight tons capacity range, high | T |  |  |  |  |  |  | 6,000 |  |  |
Significant commitment, new construction final delivery date |  |  |  |  |  |  | May 2017 |  |  |
Number of vessels under construction | Vessel |  |  |  |  | 2 |  | 8 | [1] |  |
Aggregate installment payment |  |  |  |  | $ 5,400 |  | $ 231,256 | [1] |  | $ 1,000
Significant commitment, new construction delivery date |  |  |  |  | Jun. 30, 2016 |  |  |  |  |
Obligation to be relieved |  |  |  |  | $ 21,700 |  |  |  |  |
Aggregate installment payment payment with interest |  |  |  |  | $ 12,000 |  |  |  |  |
Towing Supply Vessels |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Significant commitment, new construction brake horsepower | hp |  |  |  |  |  |  | 7,145 |  |  |
Number of vessels under construction | Vessel | [1] |  |  |  |  |  | 1 |  |  |
Aggregate installment payment | [1] |  |  |  |  |  | $ 13,580 |  |  |
Vessel Commitments |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Unfunded capital commitment | [1],[2] |  |  |  |  |  | $ 107,190 |  |  |
Number of Vessels, commitments | Vessel | [1],[2] |  |  |  |  |  | 9 |  |  |
Unfunded capital commitment, net of expected refunds |  |  |  |  |  |  | $ 64,000 |  |  |
Expected refunds from shipyards |  |  |  |  |  |  | 43,000 |  |  |
Vessels Under Construction |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | Vessel |  |  |  | 6 |  |  |  |  |  |
Refunds from cancelled vessel construction contracts |  |  | $ 12,000 |  |  | $ 24,000 | 36,000 |  |  |
Accrued interest owing on the returned installments |  |  |  |  |  |  | 3,500 |  |  |
Impairment charge on amounts not recoverable |  |  |  |  |  | $ 800 |  |  |  |
Vessels Under Construction | Shipyard Credit |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |
Offset against other payment |  |  |  |  |  |  | $ 3,500 |  |  |
[1] | Six additional option vessels and a fast supply boat are not included in the table above.
[2] | The company is entitled to receive a refund of prior shipyard payments totaling approximately $43 million (of which $12 million was received in January 2016) which would offset the remaining balance of vessel commitments. See further discussion below.

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