Acquisitions - Summary of changes in goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Business Combinations [Abstract]
Goodwill balance	$ 2,225,962	$ 2,222,805
Increase from acquisitions	38,889	337
Increase from contributions of redeemable noncontrolling interests		2,820
Goodwill balance	$ 2,264,851	$ 2,225,962