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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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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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