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Equity - Summary of Dividends Declared by Board of Directors (Detail) (USD $)
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9 Months Ended |
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Sep. 30, 2014
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8/20/13 Record Date [Member]
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| Dividends Payable [Line Items] | |
| Announced Date | Aug. 08, 2013 |
| Record Date | Aug. 20, 2013 |
| Pay Date | Aug. 29, 2013 |
| Amount per share | $ 0.06 |
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11/18/13 Record Date [Member]
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| Dividends Payable [Line Items] | |
| Announced Date | Nov. 07, 2013 |
| Record Date | Nov. 18, 2013 |
| Pay Date | Nov. 22, 2013 |
| Amount per share | $ 0.14 |
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12/30/13 Record Date [Member]
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| Dividends Payable [Line Items] | |
| Announced Date | Dec. 17, 2013 |
| Record Date | Dec. 30, 2013 |
| Pay Date | Jan. 10, 2014 |
| Amount per share | $ 0.22 |
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03/27/14 Record Date [Member]
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| Dividends Payable [Line Items] | |
| Announced Date | Mar. 13, 2014 |
| Record Date | Mar. 27, 2014 |
| Pay Date | Apr. 09, 2014 |
| Amount per share | $ 0.22 |
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06/27/14 Record Date [Member]
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| Dividends Payable [Line Items] | |
| Announced Date | Jun. 17, 2014 |
| Record Date | Jun. 27, 2014 |
| Pay Date | Jul. 10, 2014 |
| Amount per share | $ 0.22 |
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9/26/2014 Record Date [Member]
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| Dividends Payable [Line Items] | |
| Announced Date | Sep. 16, 2014 |
| Record Date | Sep. 26, 2014 |
| Pay Date | Oct. 09, 2014 |
| Amount per share | $ 0.22 |