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Dividends Declared Per Share (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Dividends Payable [Line Items] |  |  |  |
Dividend Amount | $ 0.345 | $ 0.345 | $ 1.035 | $ 1.035
Group One |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Jun. 05, 2013 |
Date Paid (Payable) |  |  | Aug. 15, 2013 |
Shareholder of Record Date |  |  | Aug. 01, 2013 |
Dividend Amount |  |  | $ 0.345 |
Group Two |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Mar. 28, 2013 |
Date Paid (Payable) |  |  | May 15, 2013 |
Shareholder of Record Date |  |  | May 01, 2013 |
Dividend Amount |  |  | $ 0.345 |
Group Three |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  |  | Jan. 17, 2013 |
Date Paid (Payable) |  |  | Feb. 15, 2013 |
Shareholder of Record Date |  |  | Feb. 01, 2013 |
Dividend Amount |  |  | $ 0.345 |
Group Four |  |  |  |
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 Five |  |  |  |
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 Six |  |  |  |
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 Seven |  |  |  |
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 |

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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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Data Type: | num:perShareItemType
Balance Type: | na
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
Name: | us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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