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Dividends Paid and Declared - Schedule of Dividends Declared (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |||
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2013
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| Equity [Abstract] | |||||
| Record Date | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 28, 2013 | Mar. 28, 2013 | |
| Date Paid | Jan. 06, 2014 | Oct. 07, 2013 | Jul. 08, 2013 | Apr. 08, 2013 | |
| Amount per share | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.125 | $ 0.500 |