XML 148 R134.htm IDEA: XBRL DOCUMENT

Commitments and Contingencies (Brazilian Customs) - Additional Information (Detail) BRL in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2011 BRL Vessel	Mar. 31, 2016 USD ($)	Mar. 31, 2016 BRL	Mar. 31, 2016 BRL
Commitments And Contingencies Disclosure [Abstract]
Fines assessed	BRL 155	$ 43.1
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		41.4	BRL 149
Fines assessed		35.4	127
Remaining amount of fines contested		$ 8.0	BRL 28
Decision disallowing the fines totaling \| BRL				BRL 127