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Cash Dividends (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2009 | Sep. 30, 2009 | Jun. 30, 2009 | Mar. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid, date | Dec. 30, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 30, 2011 | Dec. 30, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 30, 2010 | Dec. 30, 2009 | Sep. 30, 2009 | Jun. 30, 2009 | Mar. 31, 2009 |  |  |
Cash dividends paid, per share | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.20 | $ 0.20 | $ 0.20
Cash dividends paid | $ 7,788 | $ 7,777 | $ 7,772 | $ 7,708 | $ 7,709 | $ 7,704 | $ 7,706 | $ 7,677 | $ 7,676 | $ 7,675 | $ 7,675 | $ 7,655 | $ 31,045 | $ 30,796 | $ 30,681

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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 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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