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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) BRL in Millions, $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2015 BRL | Apr. 30, 2011 BRL Vessel | Sep. 30, 2016 USD ($) | Sep. 30, 2016 BRL
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Fines assessed |  | BRL 155 | $ 47.5 |
Number of Tidewater vessels that the subsidiaries failed to obtain import licenses from | Vessel |  | 17 |  |
Fines assessed | BRL 3 |  | 1.0 |
Amount of fines contested |  |  | 9.2 | BRL 30
Remaining amount of fine resolved in entity favor |  |  | $ 37.4 | 122
Original fine amount | BRL |  |  |  | BRL 155

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