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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 104,954	$ 97,182
Accumulated Amortization	(36,062)	(21,583)
Net Carrying Amount	68,892	75,599
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,200	26,200
Accumulated Amortization	(8,493)	(1,943)
Net Carrying Amount	17,707	24,257
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	55,772	48,000
Accumulated Amortization	(5,139)	(1,137)
Net Carrying Amount	50,633	46,863
Favorable Drilling Contracts
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,500	22,500
Accumulated Amortization	(22,336)	(18,482)
Net Carrying Amount	164	4,018
Internal Use Software
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	482	482
Accumulated Amortization	(94)	(21)
Net Carrying Amount	$ 388	$ 461

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
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