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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

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