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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 106,754	$ 97,182
Accumulated Amortization	(39,870)	(21,583)
Net Carrying Amount	66,884	75,599
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,000	26,200
Accumulated Amortization	(10,719)	(1,943)
Net Carrying Amount	17,281	24,257
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	55,772	48,000
Accumulated Amortization	(6,533)	(1,137)
Net Carrying Amount	49,239	46,863
Favorable Drilling Contracts
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	22,500	22,500
Accumulated Amortization	(22,500)	(18,482)
Net Carrying Amount		4,018
Internal Use Software
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	482	482
Accumulated Amortization	(118)	(21)
Net Carrying Amount	$ 364	$ 461

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-Publisher FASB
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-Topic 350
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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