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Commitments and Contingencies (Venezuelan Operations) - Additional Information (Detail)	1 Months Ended
	May 31, 2009 Vessel	Jul. 31, 2009 Vessel
Venezuelan National Oil Company
Commitments and Contingencies Disclosure [Line Items]
Number of vessels seized	11tdw_NumberOfVesselSeized / tdw_PossessingCompanyAxis = tdw_VenezuelanNationalOilCompanyMember
Petrosucre S
Commitments and Contingencies Disclosure [Line Items]
Number of vessels seized		4tdw_NumberOfVesselSeized / tdw_PossessingCompanyAxis = tdw_PetrosucreSMember

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Number of vessels seized.

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