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Stockholders' Equity - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended
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Aug. 01, 2007 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Employees | Dec. 31, 2010 Employees | Dec. 31, 2009 Employees | Feb. 01, 2012 Dividend Declared
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Dividend declaration date |  |  |  |  |  |  |  | Feb. 01, 2012
Dividend per share, declared |  |  |  |  |  |  |  | $ 0.05
Dividend payment date |  |  |  |  |  |  |  | Mar. 30, 2012
Dividend record date |  |  |  |  |  |  |  | Mar. 15, 2012
Amount approved for repurchases under stock buyback program | $ 250,000,000 |  |  |  |  |  |  |
Treasury stock shares acquired |  | 8,689 | 8,743 | 5,715 |  |  |  |
Treasury stock repurchased, value |  | 255,000 | 123,000 | 79,000 |  |  |  |
Amount authorized to purchase the Company's outstanding common stock under the program |  | 113,000,000 |  |  |  |  |  |
Treasury stock shares acquired |  |  |  |  | 135,068 | 117,083 | 114,983 |
Purchase price for treasury stock acquired |  | $ 4,314,000 | $ 1,853,000 | $ 1,623,000 | $ 4,100,000 | $ 1,700,000 | $ 1,500,000 |

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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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