Annual report pursuant to Section 13 and 15(d)

Equity - Schedule of Distributions On Common Stock (Detail)

v3.8.0.1
Equity - Schedule of Distributions On Common Stock (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Ordinary Income 26.8429% 30.65818% 62.2954%
Return of Capital 67.39436% 69.34182% 37.34781%
Long-term Capital Gain 5.76274% 0.00% 0.35679%