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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Business Combinations contingent liabilities undiscounted maximum payment	$ 85,500,000
Business Combinations contingent liabilities undiscounted maximum payment term	5 years
Fair value transfers Into levels of financial instruments	$ 0
Fair Value, Inputs, Level 3 [Member]
Business combination contingent consideration fair value disclosure	28,000,000	$ 39,800,000
Cash And Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents fair value disclosure	$ 329,600,000	$ 440,100,000