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Equity - Summary of Dividend Activity (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
First Quarter Dividend [Member] |  |
Dividends Payable [Line Items] |  |
Declaration Date | Feb. 18, 2015 | Feb. 12, 2014
Record Date | Mar. 02, 2015 | Feb. 25, 2014
Payment Date | Mar. 19, 2015 | Mar. 14, 2014
Dividend per share | $ 0.10 | $ 0.10
Second Quarter Dividend [Member] |  |
Dividends Payable [Line Items] |  |
Declaration Date | May 06, 2015 | May 07, 2014
Record Date | May 18, 2015 | May 19, 2014
Payment Date | Jun. 05, 2015 | Jun. 06, 2014
Dividend per share | $ 0.10 | $ 0.10
Third Quarter Dividend [Member] |  |
Dividends Payable [Line Items] |  |
Declaration Date | Aug. 05, 2015 | Aug. 06, 2014
Record Date | Aug. 17, 2015 | Aug. 18, 2014
Payment Date | Sep. 03, 2015 | Sep. 05, 2014
Dividend per share | $ 0.10 | $ 0.10
Fourth Quarter Dividend [Member] |  |
Dividends Payable [Line Items] |  |
Declaration Date | Nov. 04, 2015 | Nov. 05, 2014
Record Date | Nov. 16, 2015 | Nov. 17, 2014
Payment Date | Dec. 04, 2015 | Dec. 05, 2014
Dividend per share | $ 0.10 | $ 0.10

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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 The per share amount of a dividend declared, but not paid, as of the financial reporting date. + 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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