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Stockholder's Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 26, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jul. 25, 2011
Stockholders Equity [Line Items] |  |  |  |  |  |
Common stock, value of shares authorized to repurchase |  |  |  |  |  | $ 200,000,000
Stock repurchase, shares |  |  |  | 244,000 | 728,000 |
Value of shares repurchased |  |  |  | $ 8,866,000 | $ 20,809,000 |
Average price of repurchased shares |  |  |  | $ 36.32 | $ 28.59 |
Cash dividends per common share |  | $ 0.170 | $ 0.165 | $ 0.505 | $ 0.490 |
Dividend payment to common shareholders |  |  |  | $ 26,928,000 | $ 26,081,000 |
Dividend Declared One [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Cash dividends per common share |  |  |  | $ 0.165 | $ 0.160 |
Dividend payment to common shareholders |  |  |  | $ 26,928,000 | $ 26,081,000 |
Dividend Declared Two [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Cash dividends per common share |  |  |  | $ 0.170 | $ 0.165 |
Dividend payment to common shareholders |  |  |  | $ 26,928,000 | $ 26,081,000 |
Subsequent Event [Member] |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Dividend declared date | Oct. 26, 2015 |  |  |  |  |
Cash dividend to be paid | $ 0.17 |  |  |  |  |
Dividend to be paid date | Dec. 11, 2015 |  |  |  |  |
Dividend declared, shareholders of record date | Nov. 30, 2015 |  |  |  |  |

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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