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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail)
BRL in Millions, $ in Millions
 1 Months Ended 9 Months Ended
May 31, 2016
USD ($)
May 31, 2015
BRL
Apr. 30, 2011
BRL
Vessel
Dec. 31, 2016
USD ($)
Dec. 31, 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  
Deposit amount | $ $ 3.0        
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