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Common Dividends Declared Per Share (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Dividends Payable [Line Items] |  |  |  |
Dividend Amount | $ 0.345 | $ 0.345 | $ 1.380 | $ 1.380
Group One |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Sep. 19, 2012 |
Date Paid (Payable) |  |  | Nov. 15, 2012 |
Shareholder of Record Date |  |  | Nov. 01, 2012 |
Dividend Amount |  |  | $ 0.345 |
Group Two |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Jun. 06, 2012 |
Date Paid (Payable) |  |  | Aug. 15, 2012 |
Shareholder of Record Date |  |  | Aug. 01, 2012 |
Dividend Amount |  |  | $ 0.345 |
Group Three |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Mar. 22, 2012 |
Date Paid (Payable) |  |  | May 15, 2012 |
Shareholder of Record Date |  |  | May 01, 2012 |
Dividend Amount |  |  | $ 0.345 |
Group Four |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Jan. 17, 2012 |
Date Paid (Payable) |  |  | Feb. 15, 2012 |
Shareholder of Record Date |  |  | Feb. 01, 2012 |
Dividend Amount |  |  | $ 0.345 |
Group Five |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Sep. 21, 2011 |
Date Paid (Payable) |  |  | Nov. 15, 2011 |
Shareholder of Record Date |  |  | Nov. 01, 2011 |
Dividend Amount |  |  | $ 0.345 |
Group Six |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Jun. 16, 2011 |
Date Paid (Payable) |  |  | Aug. 15, 2011 |
Shareholder of Record Date |  |  | Aug. 01, 2011 |
Dividend Amount |  |  | $ 0.345 |
Group Seven |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Mar. 24, 2011 |
Date Paid (Payable) |  |  | May 16, 2011 |
Shareholder of Record Date |  |  | May 02, 2011 |
Dividend Amount |  |  | $ 0.345 |
Group Eight |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Jan. 18, 2011 |
Date Paid (Payable) |  |  | Feb. 15, 2011 |
Shareholder of Record Date |  |  | Feb. 01, 2011 |
Dividend Amount |  |  | $ 0.345 |

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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 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 dividend to be paid was declared, 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 Reference 2: 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. + 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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- Details
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