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Acquisitions - Summary of Changes in Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Business Combination [Abstract]
Goodwill balance	$ 2,264,851	$ 2,225,962
Increase from acquisitions	8,419	38,889
Increase from contributions of redeemable noncontrolling interests	12,775
Adjustments related to 2024 acquisitions	389
Goodwill balance	$ 2,286,434	$ 2,264,851

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