Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 97,182	$ 25,500
Accumulated Amortization	(21,583)	(22,768)
Net Carrying Amount	75,599	2,732
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,200	25,500
Accumulated Amortization	(1,943)	(22,768)
Net Carrying Amount	24,257	$ 2,732
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	48,000
Accumulated Amortization	(1,137)
Net Carrying Amount	46,863
Favorable Drilling Contracts
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,500
Accumulated Amortization	(18,482)
Net Carrying Amount	4,018
Internal Use Software
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	482
Accumulated Amortization	(21)
Net Carrying Amount	$ 461

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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