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Properties and Equipment, Accrued Expenses, Other Current Liabilities and Other Liabilities - Additional Information (Details)	Mar. 31, 2020 Vessel
Properties And Equipment Other Assets Accrued Expenses Other Current Liabilities And Other Liabilities [Abstract]
Number of vessels	170

X

- Definition

Number of vessels.

+ References

No definition available.

+ Details

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

X

- Definition

Properties and equipment other assets accrued expenses other current liabilities and other liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration