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Net Income per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net income $ 18,616 $ 25,513
Preferred dividends (5,815) (1,860)
Net income available to common stockholders 12,801 23,653
Dividends declared on common stock (30,997) (25,702)
Dividends on participating securities (449) (261)
Net income (loss) attributable to common stockholders $ (18,645) $ (2,310)
Denominator:    
Basic weighted average shares of common stock outstanding (shares) 67,385,191 49,563,822
Diluted weighted average shares of common stock outstanding (shares) 68,327,718 50,171,687
Basic and diluted net income per weighted average share of common stock    
Distributable Earnings (dollars per share) $ 0.46 $ 0.52
Undistributed income (loss) (dollars per share) (0.28) (0.05)
Basic and diluted net income per share of common stock (in dollars per share) $ 0.18 $ 0.47
RSUs [Member]    
Basic and diluted net income per weighted average share of common stock    
Unvested securities excluded from earnings per share calculation 942,526 607,865