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Acquisitions - Additional Information (Detail)		3 Months Ended	12 Months Ended
	Aug. 30, 2019 USD ($) Office Teammate	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Measurement period adjustments during the year			$ 5,034,000
Goodwill		$ 429,368,000	$ 429,368,000	$ 428,346,000
PCM
Business Acquisition [Line Items]
Acquisition, percentage of issued and outstanding shares acquired	100.00%
Cash purchase price	$ 745,562,000
Cash and cash equivalents acquired	84,637,000
Estimated fair value of net assets acquired	407,031,000
Identifiable intangible assets	191,370,000
Goodwill	253,894,000
Tax deductible goodwill	0
PCM | Customer relationships
Business Acquisition [Line Items]
Measurement period adjustments during the year		$ 56,700,000
Identifiable intangible assets	$ 178,900,000
PCM | Minimum
Business Acquisition [Line Items]
Number of teammates | Teammate	4,000
PCM | North America and The United Kingdom
Business Acquisition [Line Items]
Number of office locations | Office	40

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