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Declared Common Stock Dividends (Detail) (USD $) | 6 Months Ended
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Jun. 30, 2013
Dividend Payment 1st |
Dividends Payable [Line Items] |
Declaration Date | May 11, 2012
Record Date | Jun. 08, 2012
Payable Date | Jun. 22, 2012
Per Share | $ 0.20
Dividend Payment 2nd |
Dividends Payable [Line Items] |
Declaration Date | Aug. 20, 2012
Record Date | Sep. 14, 2012
Payable Date | Sep. 28, 2012
Per Share | $ 0.20
Dividend Payment 3rd |
Dividends Payable [Line Items] |
Declaration Date | Nov. 06, 2012
Record Date | Nov. 30, 2012
Payable Date | Dec. 14, 2012
Per Share | $ 0.20
Dividend Payment 4th |
Dividends Payable [Line Items] |
Declaration Date | Feb. 22, 2013
Record Date | Apr. 03, 2013
Payable Date | Apr. 15, 2013
Per Share | $ 0.53
Dividend Payment 5th |
Dividends Payable [Line Items] |
Declaration Date | May 16, 2013
Record Date | Jul. 03, 2013
Payable Date | Jul. 15, 2013
Per Share | $ 0.48

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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=27012166&loc=d3e187085-122770 + Details
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Period Type: | duration

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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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Period Type: | duration

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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 + 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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Namespace Prefix: | us-gaap_
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- Details
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