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Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended
Apr. 30, 2011
BRL
Vessel
Jun. 30, 2014
USD ($)
Jun. 30, 2014
BRL
Jun. 30, 2014
Revised
USD ($)
Jun. 30, 2014
Revised
BRL
Commitments and Contingencies Disclosure [Line Items]          
Fines assessed 155.0 $ 70.3   $ 57.6 127.0
Number of Tidewater vessels that the subsidiaries failed to obtain import licenses from 17        
Disallowed amount of total fines by the administrative appeals board   67.6 149.0    
Remaining amount of fines contested   12.7 28.0    
Decision disallowing the fines totaling     127.0