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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended								12 Months Ended
	Feb. 10, 2020	Jul. 25, 2011	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000
Stock repurchase, shares		2,588,000
Value of shares repurchased		$ (127,000,000)										$ (75,000,000)
Cash dividends per common share			$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.18	$ 0.80	$ 0.78
Dividend payment to common shareholders											$ 43,528,000	$ 42,405,000	$ 38,178,000
Average price of repurchased shares												$ 91.67
Common Stock [Member]
Stockholders Equity [Line Items]
Stock repurchase, shares											0	818,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Feb. 10, 2020
Cash dividend to be paid	$ 0.20
Dividend to be paid date	Mar. 06, 2020
Dividend declared, shareholders of record date	Feb. 24, 2020

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