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Net Income per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income $ 68,356 $ 69,893 $ 151,714 $ 98,849
Preferred dividends (11,148) (9,310) (29,768) (20,985)
Net income available to common stockholders 57,208 60,583 121,946 77,864
Dividends declared on common stock (48,507) (37,180) (139,155) (99,182)
Dividends on participating securities (625) (413) (1,884) (1,298)
Net income (loss) attributable to common stockholders $ 8,076 $ 22,990 $ (19,093) $ (22,616)
Denominator:        
Basic weighted average shares of common stock outstanding (shares) 105,446,704 71,919,549 97,546,437 68,913,362
Diluted weighted average shares of common stock outstanding (shares) 106,812,721 72,861,611 98,919,689 69,865,603
Basic and diluted net income per weighted average share of common stock        
Distributable Earnings (in dollars per share) $ 0.46 $ 0.52 $ 1.43 $ 1.44
Undistributed (loss) (in dollars per share) 0.08 0.31 (0.20) (0.33)
Basic and diluted net income per share of common stock (in dollars per share) $ 0.54 $ 0.83 $ 1.23 $ 1.11
RSUs [Member]        
Basic and diluted net income per weighted average share of common stock        
Unvested securities excluded from earnings per share calculation (shares) 1,366,016 942,062 1,373,252 952,241