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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended						9 Months Ended
	Oct. 25, 2021	Jul. 25, 2011	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		2,600,000	0			0			0	0
Value of shares repurchased		$ 127,000,000
Cash dividends per common share			$ 0.22	$ 0.22	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.64	$ 0.60
Dividend payment to common shareholders									$ 35,500,000	$ 33,000,000.0
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Oct. 25, 2021
Cash dividend to be paid	$ 0.22
Dividend to be paid date	Dec. 10, 2021
Dividend declared, shareholders of record date	Nov. 29, 2021

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Aggregate dividends paid during the period for each share of common stock outstanding.

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