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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended						9 Months Ended
	Oct. 31, 2019	Jul. 25, 2011	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		2,588,000	0			818,131			0	0
Value of shares repurchased		$ 127,000,000				$ 75,000,000				$ 75,000,000
Cash dividends per common share			$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.18	$ 0.60	$ 0.58
Dividend payment to common shareholders									$ 32,621,000	$ 31,608,000
Average price of repurchased shares						$ 91.67				$ 91.67
Common Stock [Member]
Stockholders Equity [Line Items]
Stock repurchase, shares						818,000				818,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Oct. 28, 2019
Cash dividend to be paid	$ 0.20
Dividend to be paid date	Dec. 06, 2019
Dividend declared, shareholders of record date	Nov. 25, 2019

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