Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Schedule of Distributions On Common Stock (Detail)

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Stockholders' Equity - Schedule of Distributions On Common Stock (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]      
Ordinary Income 62.2954% 95.66078% 100.00%
Return of Capital 37.34781% 4.33922% 0.00%
Long-term Capital Gain 0.35679% 0.00% 0.00%