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Stockholders' Equity Common Stock (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 Dividend 1 [Member] | Dec. 31, 2012 Dividend 1 [Member] Common Stock [Member] | Dec. 31, 2012 Dividend 2 [Member] | Dec. 31, 2012 Dividend 2 [Member] Common Stock [Member] | Dec. 31, 2012 Dividend Three [Member] | Dec. 31, 2012 Dividend Three [Member] Common Stock [Member] | Dec. 31, 2012 Dividend Four [Member] | Dec. 31, 2012 Dividend Four [Member] Common Stock [Member] | Dec. 31, 2012 Dividend Five [Member] | Dec. 31, 2012 Dividend Five [Member] Common Stock [Member] | Dec. 31, 2012 Dividend Six [Member] | Dec. 31, 2012 Dividend Six [Member] Common Stock [Member] | Dec. 31, 2012 Dividend Seven [Member] | Dec. 31, 2012 Dividend Seven [Member] Common Stock [Member] | Dec. 31, 2012 Dividend Eight [Member] | Dec. 31, 2012 Dividend Eight [Member] Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Declaration Date |  |  |  |  |  |  |  |  |  | Mar. 10, 2011 |  | May 10, 2011 |  | Aug. 04, 2011 |  | Nov. 03, 2011 |  | Feb. 28, 2012 |  | May 03, 2012 |  | Aug. 06, 2012 |  | Nov. 01, 2012
Record date |  |  |  |  |  |  |  |  |  | Mar. 31, 2011 |  | Jun. 30, 2011 |  | Sep. 30, 2011 |  | Dec. 31, 2011 |  | Mar. 31, 2012 |  | Jun. 29, 2012 |  | Sep. 28, 2012 |  | Dec. 31, 2012
Payment date |  |  |  |  |  |  |  |  |  | Apr. 12, 2011 |  | Jul. 12, 2011 |  | Oct. 12, 2011 |  | Jan. 12, 2012 |  | Apr. 12, 2012 |  | Jul. 12, 2012 |  | Oct. 12, 2012 |  | Jan. 14, 2013
Dividend Amount | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 | $ 0.40 |  | $ 0.40 |  | $ 0.40 |  | $ 0.40 |  | $ 0.40 |  | $ 0.40 |  | $ 0.40 |  | $ 0.40 |

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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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