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Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Deferred Credits and Other Liabilities [Abstract]
Pension liabilities	$ 31,822	$ 32,545
Liability for uncertain tax positions	43,630	48,577
Deferred tax liability	2,571	2,571
Other	13,555	14,704
Other liabilities and deferred credits	$ 91,578	$ 98,397

X

- Definition

Liability for uncertain tax positions noncurrent of consolidated entities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other Liabilities, Credits, Noncurrent

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
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X

- Definition

Noncurrent portion of the defined benefit and defined contribution pension plans, postemployment plans, and Multiemployer Plans, excluding the Postretirement benefits liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
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X

- References

No definition available.

+ Details

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X

- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e31931-109318

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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X

- Definition

Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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