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Stockholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 9 Months Ended | 1 Months Ended
--- | --- | --- | ---
Aug. 01, 2007 | Sep. 30, 2011 | Oct. 26, 2011 Dividend Declared
Stockholders Equity Note [Line Items] |  |  |
Dividend declaration date |  |  | Oct. 26, 2011
Dividend per share, declared |  |  | $ 0.05
Dividend payment date |  |  | Dec. 30, 2011
Dividend record date |  |  | Dec. 15, 2011
Amount approved for repurchases under stock buyback program | $ 250,000,000 |  |
Treasury stock shares acquired |  | 8,025 |
Treasury stock repurchased, value |  | 242,000 |
Amount authorized to purchase the Company's outstanding common stock under the program |  | 113,000,000 |
Treasury stock shares acquired from employees |  | 130,921 |
Purchase price for treasury stock acquired from employees |  | $ 4,000,000 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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=6959260&loc=d3e187085-122770 + Details
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- Definition The day, month and year (YYYY-MM-DD) that the dividend to be paid was declared. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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