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Stockholder's Equity - Additional Information (Detail) - USD ($)			3 Months Ended						9 Months Ended
	Oct. 24, 2016	Jul. 25, 2011	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		1,770,000							45,000	244,000
Value of shares repurchased		$ 52,000,000							$ 1,545,000	$ 8,866,000
Average price of repurchased shares									$ 34.50	$ 36.32
Cash dividends per common share			$ 0.170	$ 0.170	$ 0.170	$ 0.170	$ 0.170	$ 0.165	$ 0.510	$ 0.505
Dividend payment to common shareholders			$ 27,249,000	$ 27,249,000	$ 27,249,000	$ 26,928,000	$ 26,928,000	$ 26,928,000	$ 27,249,000	$ 26,928,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Oct. 24, 2016
Cash dividend to be paid	$ 0.17
Dividend to be paid date	Dec. 09, 2016
Dividend declared, shareholders of record date	Nov. 28, 2016

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Average price of repurchased shares.

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Stockholders Equity [Line Items]

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

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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