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Goodwill and Intangible Assets - Narrative (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 522,766	$ 522,766
Clinical Services
Finite-Lived Intangible Assets [Line Items]
Goodwill	458,782	458,782
Pharma Services
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 63,984	$ 63,984

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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