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Net Income per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator:    
Net income $ 47,125 $ 18,616
Preferred dividends (9,310) (5,815)
Net income available to common stockholders 37,815 12,801
Dividends declared on common stock (42,146) (30,997)
Dividends on participating securities (630) (449)
Net income (loss) attributable to common stockholders $ (4,961) $ (18,645)
Denominator:    
Basic weighted average shares of common stock outstanding (shares) 91,612,447 67,385,191
Diluted weighted average shares of common stock outstanding (shares) 92,998,250 68,327,718
Basic and diluted net income per weighted average share of common stock    
Distributable Earnings (dollars per share) $ 0.46 $ 0.46
Undistributed income (loss) (dollars per share) (0.05) (0.28)
Basic and diluted net income per share of common stock (in dollars per share) $ 0.41 $ 0.18
RSUs [Member]    
Basic and diluted net income per weighted average share of common stock    
Unvested securities excluded from earnings per share calculation 1,385,803 942,526