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Commitments and Contingencies - Additional Information (Detail) - Vessel Commitments $ in Millions	Mar. 31, 2018 USD ($) Vessel T
Significant Purchase and Supply Commitment [Line Items]
Remaining Balance, commitments | $	$ 4.2
Number of Vessels, commitments | Vessel	1
Significant commitment, new construction deadweight tons capacity | T	5,400

X

- Definition

Commitments, remaining expenditures.

+ References

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+ Details

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Balance Type:	debit
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- Definition

Significant Commitment New Construction Dead Weight Tons Capacity

+ References

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+ Details

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- Definition

Significant commitment number of vessel.

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Significant Purchase and Supply Commitment [Line Items]

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

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Namespace Prefix:
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Balance Type:
Period Type: