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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 2,027,135 | $ 256,655
Accumulated Amortization | (397,772) | (136,773)
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,709,115 | 195,435
Accumulated Amortization | (266,507) | (94,690)
Trade Names |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 201,861 | 52,061
Accumulated Amortization | (125,375) | (38,138)
Subcontractor Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,440 | 5,440
Accumulated Amortization | (2,360) | (1,944)
Non-compete Agreements |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 13,519 | 3,719
Accumulated Amortization | (2,586) | $ (2,001)
Developed Technology |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 97,200 |
Accumulated Amortization | $ (944) |

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