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Goodwill and Intangible Assets - Summary of Carrying Values of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 151,566 | $ 36,876
Accumulated Amortization | 48,651 | 31,925
Total | 102,915 | 4,951
Customer Relationships [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 109,551 | 32,823
Accumulated Amortization | 37,784 | 31,604
Total | 71,767 | 1,219
Technology [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,577 | 3,610
Accumulated Amortization | 5,347 | 295
Total | 11,230 | 3,315
Backlog [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,000 |
Accumulated Amortization | 4,875 |
Total | 8,125 |
Trade Name [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 12,438 | 443
Accumulated Amortization | 645 | 26
Total | $ 11,793 | $ 417

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