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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended						9 Months Ended
	Oct. 29, 2018	Jul. 25, 2011	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		2,588,000							818,000	0
Value of shares repurchased		$ 127,000,000	$ 75,000,000						$ 75,000,000
Average price of repurchased shares									$ 91.67
Cash dividends per common share			$ 0.20	$ 0.20	$ 0.18	$ 0.175	$ 0.175	$ 0.175	$ 0.58	$ 0.525
Dividend payment to common shareholders									$ 31,608,000	$ 28,403,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Oct. 29, 2018
Cash dividend to be paid	$ 0.20
Dividend to be paid date	Dec. 07, 2018
Dividend declared, shareholders of record date	Nov. 26, 2018

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

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