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Sale/ Leaseback Arrangements - Additional Information (Detail) - Vessel | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014
Leases [Abstract] |  |  |  |  |  |  |  |  |
Number of vessels sold | 1 | 3 | 1 | 1 | 4 | 4 | 2 | 6 | 10

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- Definition Sale leaseback transaction, number of vessels. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration