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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 104,954 | $ 97,182
Accumulated Amortization | (27,029) | (21,583)
Net Carrying Amount | 77,925 | 75,599
Customer Relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 26,200 | 26,200
Accumulated Amortization | (4,126) | (1,943)
Net Carrying Amount | 22,074 | 24,257
Developed Technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 55,772 | 48,000
Accumulated Amortization | (2,274) | (1,137)
Net Carrying Amount | 53,498 | 46,863
Favorable Drilling Contracts |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 22,500 | 22,500
Accumulated Amortization | (20,583) | (18,482)
Net Carrying Amount | 1,917 | 4,018
Internal Use Software |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 482 | 482
Accumulated Amortization | (46) | (21)
Net Carrying Amount | $ 436 | $ 461

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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