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Net Income per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income $ 69,893 $ 25,847 $ 98,849 $ 76,016
Preferred dividends (9,310) (2,304) (20,985) (6,023)
Net income available to common stockholders 60,583 23,543 77,864 69,993
Dividends declared on common stock (37,180) (29,544) (99,182) (80,955)
Dividends on participating securities (413) (258) (1,298) (779)
Net income (loss) attributable to common stockholders $ 22,990 $ (6,259) $ (22,616) $ (11,741)
Denominator:        
Basic weighted average shares of common stock outstanding (shares) 71,919,549 59,355,613 68,913,362 55,818,731
Diluted weighted average shares of common stock outstanding (shares) 72,861,611 59,934,008 69,865,603 56,415,082
Basic and diluted net income per weighted average share of common stock        
Distributable Earnings (dollars per share) $ 0.52 $ 0.50 $ 1.44 $ 1.45
Undistributed income (loss) (dollars per share) 0.31 (0.11) (0.33) (0.21)
Basic and diluted net income per share of common stock (in dollars per share) $ 0.83 $ 0.39 $ 1.11 $ 1.24
RSUs [Member]        
Basic and diluted net income per weighted average share of common stock        
Unvested securities excluded from earnings per share calculation 942,062,000 578,395,000 952,241,000 596,351,000