Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 84,254	$ 106,754
Accumulated Amortization	(21,036)	(39,870)
Net Carrying Amount	63,218	66,884
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	28,000	28,000
Accumulated Amortization	(12,967)	(10,719)
Net Carrying Amount	15,033	17,281
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	55,772	55,772
Accumulated Amortization	(7,927)	(6,533)
Net Carrying Amount	47,845	49,239
Favorable Drilling Contracts
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount		22,500
Accumulated Amortization		(22,500)
Internal Use Software
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	482	482
Accumulated Amortization	(142)	(118)
Net Carrying Amount	$ 340	$ 364