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Net Income per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income $ 10,338 $ 24,658 $ 28,956 $ 50,169
Preferred dividends (5,860) (1,860) (11,675) (3,720)
Net income available to common stockholders 4,478 22,798 17,281 46,449
Dividends declared on common stock (31,005) (25,709) (62,002) (51,411)
Dividends on participating securities (437) (259) (885) (521)
Net income (loss) attributable to common stockholders $ (26,964) $ (3,170) $ (45,606) $ (5,483)
Denominator:        
Basic weighted average shares of common stock outstanding (shares) 67,402,311 58,429,155 67,393,751 54,020,978
Diluted weighted average shares of common stock outstanding (shares) 68,374,557 59,022,217 68,351,137 54,621,401
Basic and diluted net income per weighted average share of common stock        
Distributable Earnings (dollars per share) $ 0.46 $ 0.44 $ 0.92 $ 0.95
Undistributed income (loss) (dollars per share) (0.40) (0.05) (0.68) (0.10)
Basic and diluted net income per share of common stock (in dollars per share) $ 0.06 $ 0.39 $ 0.24 $ 0.85
RSUs [Member]        
Basic and diluted net income per weighted average share of common stock        
Unvested securities excluded from earnings per share calculation 972,246 593,062 957,386 600,423