Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response))
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

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- Definition

Supplemental financial information.

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No definition available.

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Supplemental Financial Information - Additional Information (Detail) $ in Millions		3 Months Ended
	Dec. 02, 2015 Subsidiary	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Supplemental Financial Information [Line Items]
Recognized mobilization revenue		$ 0.6
Amortized contract fulfillment costs		$ 1.5	$ 770,000.0
Chapter Eleven Restructuring Agreement and Emergence from Voluntary Reorganization
Supplemental Financial Information [Line Items]
Number of subsidiaries acquired \| Subsidiary	2