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Income Per Share and Stockholders' Equity - Narrative (Detail) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Feb. 28, 2019	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Nov. 30, 2019	Aug. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Authorized share repurchase amount	$ 300,000,000.0							$ 500,000,000.0
Authorized share repurchase term	3 years
Authorized share additional repurchase amount								$ 100,000,000.0	$ 100,000,000.0
Shares repurchased during the period, value		$ 24,133,000	$ 64,100,000		$ 88,275,000	$ 50,028,000	$ 50,000,000.0
Shares repurchased during the period (in shares)		300,454	831,274				1,050,084
Average price per share (in dollars per share)		$ 80.31	$ 77.15				$ 47.62
Capacity remaining under current stock repurchase program		$ 261,700,000			$ 261,700,000
Contingently Issuable Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded in computation of diluted income per share (in shares)		3,974		2,381,476	15,852	1,585,601

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