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Subsequent Event - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 31, 2014 Subsequent Event Dividend Declared
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.36 | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.31 | $ 1.44 | $ 1.24 | $ 0.92 | $ 0.38
Dividend payable date |  |  |  |  |  |  |  |  |  |  |  | Mar. 07, 2014
Dividend payable, stockholders of record date |  |  |  |  |  |  |  |  |  |  |  | Feb. 20, 2014
Dividend announcement date |  |  |  |  |  |  |  |  |  |  |  | Jan. 31, 2014

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- Definition Date the dividend was announced. + References No definition available. + Details
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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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- 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 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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