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Schedule of Vessel Commitments (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2014 Vessel
Significant Purchase and Supply Commitment [Line Items]
Number of Vessels, commitments	30tdw_SignificantCommitmentNumberOfVessel
Total cost, commitments	$ 847,841
Invested, commitments	343,956
Remaining Balance, commitments	503,885tdw_CommitmentsRemainingExpenditures
Deepwater PSVs
Significant Purchase and Supply Commitment [Line Items]
Number of vessels under construction	21
Total cost, under construction	713,903
Invested, under construction	258,460
Remaining Balance, under construction	455,443
Towing Supply Vessels
Significant Purchase and Supply Commitment [Line Items]
Number of vessels under construction	6
Total cost, under construction	112,284
Invested, under construction	64,542
Remaining Balance, under construction	47,742
Other
Significant Purchase and Supply Commitment [Line Items]
Number of vessels under construction	1
Total cost, under construction	8,014
Invested, under construction	8,014
Vessel Commitments
Significant Purchase and Supply Commitment [Line Items]
Number of Vessels, commitments	28
Total cost, commitments	834,201
Invested, commitments	331,016
Remaining Balance, commitments	503,185
Remotely Operated Vehicles Commitments
Significant Purchase and Supply Commitment [Line Items]
Number of Vessels, commitments	2
Total cost, commitments	13,640
Invested, commitments	12,940
Remaining Balance, commitments	$ 700