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Stockholders' Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Jan. 31, 2014
Monthly Distribution One [Member]
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Feb. 28, 2013
Monthly Distribution One [Member]
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Sep. 30, 2014
Monthly Distribution One [Member]
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Sep. 30, 2013
Monthly Distribution One [Member]
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Feb. 28, 2014
Monthly Distribution Two [Member]
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Mar. 28, 2013
Monthly Distribution Two [Member]
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Sep. 30, 2014
Monthly Distribution Two [Member]
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Sep. 30, 2013
Monthly Distribution Two [Member]
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Mar. 31, 2014
Monthly Distribution Three [Member]
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Apr. 30, 2013
Monthly Distribution Three [Member]
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Sep. 30, 2014
Monthly Distribution Three [Member]
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Sep. 30, 2013
Monthly Distribution Three [Member]
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Apr. 30, 2014
Monthly Distribution Four [Member]
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May 31, 2013
Monthly Distribution Four [Member]
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Sep. 30, 2014
Monthly Distribution Four [Member]
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Sep. 30, 2013
Monthly Distribution Four [Member]
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May 30, 2014
Monthly Distribution Five [Member]
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Jun. 28, 2013
Monthly Distribution Five [Member]
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Sep. 30, 2014
Monthly Distribution Five [Member]
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Sep. 30, 2013
Monthly Distribution Five [Member]
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Jun. 30, 2014
Monthly Distribution Six [Member]
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Jul. 31, 2013
Monthly Distribution Six [Member]
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Sep. 30, 2014
Monthly Distribution Six [Member]
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Sep. 30, 2013
Monthly Distribution Six [Member]
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Aug. 05, 2014
Monthly Distribution Seven [Member]
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Aug. 30, 2013
Monthly Distribution Seven [Member]
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Sep. 30, 2014
Monthly Distribution Seven [Member]
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Sep. 30, 2013
Monthly Distribution Seven [Member]
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Aug. 29, 2014
Monthly Distribution Eight [Member]
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Sep. 30, 2013
Monthly Distribution Eight [Member]
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Sep. 30, 2014
Monthly Distribution Eight [Member]
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Sep. 30, 2013
Monthly Distribution Eight [Member]
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Sep. 30, 2014
Monthly Distribution Nine [Member]
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Sep. 30, 2014
Monthly Distribution Nine [Member]
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| Class of Stock [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Dividend Declaration Date | Jan. 07, 2014 | Feb. 05, 2013 | Jan. 07, 2014 | Feb. 05, 2013 | Jan. 07, 2014 | Apr. 09, 2013 | Apr. 08, 2014 | Apr. 09, 2013 | Apr. 08, 2014 | Apr. 09, 2013 | Apr. 08, 2014 | Jul. 09, 2013 | Jul. 15, 2014 | Jul. 09, 2013 | Jul. 15, 2014 | Jul. 09, 2013 | Jul. 15, 2014 | |||||||||||||||||||||
| Record Date | Jan. 22, 2014 | Feb. 15, 2013 | Feb. 19, 2014 | Mar. 15, 2013 | Mar. 17, 2014 | Apr. 22, 2013 | Apr. 21, 2014 | May 20, 2013 | May 20, 2014 | Jun. 19, 2013 | Jun. 19, 2014 | Jul. 19, 2013 | Jul. 25, 2014 | Aug. 21, 2013 | Aug. 20, 2014 | Sep. 18, 2013 | Sep. 19, 2014 | |||||||||||||||||||||
| Dividend Payment Date | Jan. 31, 2014 | Feb. 28, 2013 | Feb. 28, 2014 | Mar. 28, 2013 | Mar. 31, 2014 | Apr. 30, 2013 | Apr. 30, 2014 | May 31, 2013 | May 30, 2014 | Jun. 28, 2013 | Jun. 30, 2014 | Jul. 31, 2013 | Aug. 05, 2014 | Aug. 30, 2013 | Aug. 29, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | |||||||||||||||||||||
| Dividend Distribution per Share | $ 0.09 | $ 0.36 | $ 0.27 | $ 0.80 | $ 0.03 | $ 0.04 | $ 0.03 | $ 0.04 | $ 0.03 | $ 0.12 | $ 0.03 | $ 0.12 | $ 0.03 | $ 0.12 | $ 0.03 | $ 0.12 | $ 0.03 | $ 0.12 | $ 0.03 | $ 0.12 | $ 0.03 | |||||||||||||||||