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Commitments and Contingencies - Additional Information (Detail) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) | Oct. 31, 2016 USD ($) | Jun. 30, 2015 Vessel T hp | May 31, 2015 USD ($) Vessel T | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) Vessel T hp | Sep. 30, 2015 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Refunds from cancelled vessel construction contracts |  |  |  |  |  |  | $ 11,515 |  | $ 36,190 |  |
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 |  |  |  |
Vessel Commitments |  |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining Balance, commitments | [1] |  |  |  |  |  | $ 47,974 |  |  |  |
Number of Vessels, commitments | Vessel | [1] |  |  |  |  |  | 3 |  |  |  |
Unfunded capital commitment, net of expected refunds |  |  |  |  |  |  | $ 33,700 |  |  |  |
Expected refunds from shipyards |  |  |  |  |  |  | $ 14,300 |  |  |  |
Deepwater PSVs |  |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Significant commitment, new construction deadweight tons capacity range, low | T |  |  |  |  |  |  | 4,700 |  |  |  |
Significant commitment, new construction deadweight tons capacity range, high | T |  |  |  |  |  |  | 5,400 |  |  |  |
Number of vessels under construction | Vessel |  |  |  |  | 2 |  | 3 | [2] |  |  |
Significant commitment, new construction deadweight tons capacity | T |  |  |  |  | 3,800 |  |  |  |  |  |
Refunds from cancelled vessel construction contracts |  |  |  |  |  |  | $ 19,100 |  |  |  |
Impairment charge on amounts not recoverable |  |  |  |  |  | $ 1,900 |  |  |  |  |
Aggregate installment payment |  |  |  |  | $ 5,400 |  | $ 115,683 | [2] |  |  |
Obligation to be relieved |  |  |  |  | 21,700 |  |  |  |  |  |
Aggregate installment payment payment with interest |  |  |  |  | $ 11,900 |  |  |  |  |  |
Shipyard returned to the company |  |  |  |  |  | 11,500 |  |  |  |  |
Shipyard owed amount |  |  |  |  |  | 11,700 |  |  |  |  |
Foreign taxes on interest |  |  |  |  |  | 200 |  |  |  |  |
Remaining installment obligation held |  |  |  |  |  | $ 250 |  |  |  |  |
Extended option period for vessels |  |  |  |  |  |  | Dec. 31, 2016 |  |  |  |
Deepwater PSVs | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net payment to company on vessel construction |  |  | $ 14,000 |  |  |  |  |  |  |  |
Vessels Under Construction |  |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of vessels under construction | Vessel |  |  |  | 6 |  |  | 6 |  |  |  |
Significant commitment, new construction brake horsepower | hp |  |  |  | 7,145 |  |  | 7,145 |  |  |  |
Significant commitment, new construction deadweight tons capacity | T |  |  |  | 4,700 |  |  | 4,700 |  |  |  |
Deferred final installment of vessel construction contracts |  | $ 5,100 |  |  |  |  |  |  |  |  |
Refunds from cancelled vessel construction contracts |  |  |  |  |  |  |  |  |  |  | $ 36,000
Obligation to pay additional amount due to termination |  |  |  |  |  |  |  |  |  |  | 50,000
Accrued interest owing on the returned installments |  | $ 3,500 |  |  |  |  |  |  |  |  | 3,500
Impairment charge on amounts not recoverable |  |  |  |  |  |  |  |  |  |  | $ 800
Vessels Under Construction | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Refunds from cancelled vessel construction contracts |  |  |  |  |  |  |  |  |  | $ 26,000 |
Obligation to pay additional amount due to termination |  |  |  |  |  |  |  |  |  | 35,000 |
Accrued interest owing on the returned installments |  |  |  |  |  |  |  |  |  | $ 3,800 |
Minimum | Deepwater PSVs |  |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Significant commitment, new construction final delivery date |  |  |  |  |  |  | 2017-02 |  |  |  |
Maximum | Deepwater PSVs |  |  |  |  |  |  |  |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Significant commitment, new construction final delivery date |  |  |  |  |  |  | 2017-06 |  |  |  |
[1] | The company is entitled to receive a refund of prior shipyard payments totaling $14.3 million which would reduce the remaining balance of vessel commitments. See further discussion below.
[2] | Six additional option vessels and a fast supply boat are not included in the table above.

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