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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail)
BRL in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Apr. 30, 2011
BRL
Vessel
Sep. 30, 2015
USD ($)
Sep. 30, 2015
BRL
Commitments and Contingencies Disclosure [Line Items]      
Fines assessed BRL 155 $ 39  
Number of Tidewater vessels that the subsidiaries failed to obtain import licenses from | Vessel 17    
Disallowed amount of total fines by the administrative appeals board   38 BRL 149
Remaining amount of fines contested   7 28
Decision disallowing the fines totaling     127
Revised      
Commitments and Contingencies Disclosure [Line Items]      
Fines assessed   $ 32 BRL 127