XML 177 R156.htm IDEA: XBRL DOCUMENT v3.7.0.1

Summary of Vessels and ROVs Impaired, Amount of Impairment Incurred and Combined Fair Value of Assets after Impairment Charges (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2017 USD ($) Vessel Vehicle	Mar. 31, 2016 USD ($) Vessel	Mar. 31, 2015 USD ($) Vessel
Asset Impairment Charges [Abstract]
Number of vessels impaired during the period | Vessel									132	58	12
Number of ROVs impaired during the period | Vehicle									8
Amount of impairment incurred	$ 64,857	$ 253,422	$ 129,562	$ 36,886	$ 55,540	$ 15,141	$ 31,672	$ 14,958	$ 484,727	$ 117,311	$ 14,525
Combined fair value of assets incurring impairment after having recorded impairment charges									$ 933,068	$ 422,655	$ 28,509

X

- Definition

Assets Fair Value Disclosure 1

+ References

No definition available.

+ Details

Name:	tdw_AssetsFairValueDisclosure1
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of remotely operated vehicles impaired during period.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfRemotelyOperatedVehiclesImpairedDuringPeriod
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of vessels impaired during period.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsImpairedDuringPeriod
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AssetImpairmentChargesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration