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Dividends/Distributions - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dividends [Line Items]    
Distributions paid, per share $ 0.75 $ 0.68
Distributions paid, preferred stockholders $ 91 $ 91
Distributions paid, preferred stockholders, per share $ 15.95 $ 15.95
Taxable Income Distribution [Member]    
Dividends [Line Items]    
Distributions paid $ 72,734 $ 65,223
Distributions paid, per share $ 0.75 $ 0.68