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Stockholder's Equity - Additional Information (Detail) - USD ($)		3 Months Ended								12 Months Ended
	Feb. 08, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 25, 2011
Stockholders Equity [Line Items]
Common stock, value of shares authorized to repurchase													$ 200,000,000
Stock repurchase, shares										369,133	727,912
Value of shares repurchased										$ 13,294,000	$ 20,809,000	$ 2,875,000
Average price of repurchased shares										$ 36.01	$ 28.59
Cash dividends per common share		$ 0.170	$ 0.170	$ 0.170	$ 0.165	$ 0.165	$ 0.165	$ 0.165	$ 0.160	$ 0.675	$ 0.655	$ 0.640
Dividend payment to common shareholders										$ 35,969,000	$ 34,851,000	$ 33,975,000
Subsequent Event [Member]
Stockholders Equity [Line Items]
Dividend declared date	Feb. 08, 2016
Cash dividend to be paid	$ 0.17
Dividend to be paid date	Mar. 11, 2016
Dividend declared, shareholders of record date	Feb. 29, 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Date the declared dividend will be paid, in CCYY-MM-DD format.

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-SubTopic 10
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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 dividend to be paid was declared, in CCYY-MM-DD format.

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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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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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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