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Declared Common Stock Dividends (Detail) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Dividends Payable [Line Items] |  |
Per Share | $ 0.54 | $ 0.54
Dividend Payment 1st |  |
Dividends Payable [Line Items] |  |
Declaration Date | Feb. 20, 2015 |
Record Date | Apr. 02, 2015 |
Payable Date | Apr. 15, 2015 |
Per Share | $ 0.54 |
Dividend Payment 2nd |  |
Dividends Payable [Line Items] |  |
Declaration Date | May 14, 2015 |
Record Date | Jul. 02, 2015 |
Payable Date | Jul. 15, 2015 |
Per Share | $ 0.54 |
Dividend Payment 3rd |  |
Dividends Payable [Line Items] |  |
Declaration Date | Aug. 13, 2015 |
Record Date | Oct. 02, 2015 |
Payable Date | Oct. 15, 2015 |
Per Share | $ 0.54 |
Dividend Payment 4th |  |
Dividends Payable [Line Items] |  |
Declaration Date | Dec. 10, 2015 |
Record Date | Jan. 04, 2016 |
Payable Date | Jan. 15, 2016 |
Per Share | $ 0.54 |
Dividend Payment 5th |  |
Dividends Payable [Line Items] |  |
Declaration Date | Feb. 19, 2016 |
Record Date | Apr. 01, 2016 |
Payable Date | Apr. 15, 2016 |
Per Share | $ 0.54 |

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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 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 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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