Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Intangible assets
Gross carrying amount	$ 97,518	$ 88,449
Accumulated Amortization	$ 65,624	67,966
Customer contracts [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	1 year
Gross carrying amount	$ 260	800
Accumulated Amortization	101	526
Customer relationships [Member]
Intangible assets
Gross carrying amount	75,908	73,629
Accumulated Amortization	$ 53,421	56,232
Customer relationships [Member] | Minimum [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	3 years
Customer relationships [Member] | Maximum [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	13 years
Non-competition Agreements [Member]
Intangible assets
Gross carrying amount	$ 2,020	2,090
Accumulated Amortization	$ 1,347	1,541
Non-competition Agreements [Member] | Minimum [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	4 years
Non-competition Agreements [Member] | Maximum [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	5 years
Trade names [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	6 years
Gross carrying amount	$ 6,000	6,130
Accumulated Amortization	5,148	4,287
Technology-Based Intangible Assets [Member]
Intangible assets
Gross carrying amount	13,330	5,800
Accumulated Amortization	$ 5,607	$ 5,380
Technology-Based Intangible Assets [Member] | Minimum [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	2 years
Technology-Based Intangible Assets [Member] | Maximum [Member]
Intangible assets
Finite-Lived Intangible Asset, Useful Life	5 years