Goodwill and Other Intangible Assets - Summary of Carrying Values of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 152,266	$ 151,937
Accumulated Amortization	68,880	54,574
Total	83,386	97,363
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	109,977	109,825
Accumulated Amortization	46,699	40,169
Total	63,278	69,656
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,815	16,661
Accumulated Amortization	9,326	7,051
Total	7,489	9,610
Backlog [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,000	13,000
Accumulated Amortization	11,375	6,500
Total	1,625	6,500
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,474	12,451
Accumulated Amortization	1,480	854
Total	$ 10,994	$ 11,597