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Stockholders' Equity - Additional Information (Detail) - USD ($)			3 Months Ended								12 Months Ended
	Feb. 12, 2018	Jul. 25, 2011	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase		$ 200,000,000
Stock repurchase, shares		1,770,000									0	44,798
Value of shares repurchased		$ 52,000,000										$ 1,545,000	$ 13,294,000
Average price of repurchased shares												$ 34.50
Cash dividends per common share			$ 0.180	$ 0.175	$ 0.175	$ 0.175	$ 0.170	$ 0.170	$ 0.170	$ 0.170	$ 0.71	$ 0.68	$ 0.68
Dividend payment to common shareholders			$ 38,178,000	$ 38,178,000	$ 38,178,000	$ 38,178,000	$ 36,361,000	$ 36,361,000	$ 36,361,000	$ 36,361,000	$ 38,178,000	$ 36,361,000	$ 35,969,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Feb. 12, 2018
Cash dividend to be paid	$ 0.18
Dividend to be paid date	Mar. 09, 2018
Dividend declared, shareholders of record date	Feb. 26, 2018

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Date the declared dividend will be paid, in CCYY-MM-DD format.

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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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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of stock repurchase plan authorized.

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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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