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Acquisitions - Summary of Changes in Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Business Combinations [Abstract]
Goodwill balance	$ 2,085,104	$ 2,044,837
Increase from contribution of redeemable noncontrolling interests	20,200	3,300
Increase from 2019 acquisitions		36,967
Adjustments related to 2019 acquisitions	(40)
Goodwill balance	$ 2,105,264	$ 2,085,104

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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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments 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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