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Acquisitions - Summary of Changes in Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Combinations [Abstract]
Goodwill balance			$ 2,105,264	$ 2,085,104
Increase from acquisitions			97,122
Increase from contribution of redeemable noncontrolling interests				20,200
Adjustments related to 2019 acquisitions				(40)
2021 dispositions	$ (700)	$ (1,800)	(2,449)
Goodwill balance	$ 2,199,937		$ 2,199,937	$ 2,105,264

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Increase in goodwill from contribution of redeemable non-controlling interests.

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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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