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Income Per Share and Stockholders' Equity - Narrative (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 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						$ 500,000,000
Authorized share repurchase term	3 years
Authorized share additional repurchase amount							$ 100,000,000	$ 100,000,000
Shares repurchased during the period, value		$ 100,010,000		$ 188,285,000	$ 50,028,000	$ 50,000,000
Shares repurchased during the period (in shares)		1,025,068		2,156,796		1,050,084
Average price per share (in dollars per share)		$ 97.55		$ 87.29		$ 47.62
Capacity remaining under current stock repurchase program		$ 161,700,000		$ 161,700,000
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)		30,903	1,294,385	31,666	1,191,464

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