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Stockholder's Equity - Additional Information (Detail) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2013 | Mar. 31, 2012
Equity [Abstract] |  |  |
Common stock, value of shares authorized to repurchase |  | $ 200,000,000 |
Stock repurchase, shares |  | 61 |
Value of shares repurchased |  | 1,668,000 |
Average price of repurchased shares |  | $ 27.35 |
Cash dividend to be paid | $ 0.16 | $ 0.16 | $ 0.15
Dividend payment to common shareholders |  | $ 8,448,000 | $ 7,877,000
Dividend declared date |  |  | May 06, 2013
Dividend to be paid date |  |  | Jun. 14, 2013
Dividend declared, shareholders of record date |  |  | Jun. 03, 2013

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Cash outflow in the form of ordinary dividends to common shareholders, generally out of earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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