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Goodwill and Intangible Assets - Summary of Carrying Values of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 151,876 | $ 36,876
Accumulated Amortization | 43,215 | 31,925
Total | 108,661 | 4,951
Customer Relationships [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 109,794 | 32,823
Accumulated Amortization | 35,855 | 31,604
Total | 73,939 | 1,219
Technology [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,635 | 3,610
Accumulated Amortization | 3,671 | 295
Total | 12,964 | 3,315
Backlog [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,000 |
Accumulated Amortization | 3,250 |
Total | 9,750 |
Trade Name [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 12,447 | 443
Accumulated Amortization | 439 | 26
Total | $ 12,008 | $ 417

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