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Summary of Goodwill as a Percentage of Total Assets and Stockholders' Equity (Detail)	Mar. 31, 2014	Mar. 31, 2013
Goodwill [Line Items]
Goodwill as a percentage of total assets	6.00%	7.00%
Goodwill as a percentage of stockholders' equity	11.00%	12.00%

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- Definition

Goodwill, Percentage of Stockholders' Equity

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
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Balance Type:	na
Period Type:	instant

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- Definition

Goodwill, Percentage of Total Assets

+ References

No definition available.

+ Details

Name:	tdw_GoodwillPercentageOfTotalAssets
Namespace Prefix:	tdw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

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Period Type:	duration