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Net Income per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net income $ 25,847 $ 19,159 $ 76,016 $ 60,698
Preferred dividends (2,304) (1,860) (6,023) (5,580)
Net income available to common stockholders 23,543 17,299 69,993 55,118
Dividends declared on common stock (29,544) (18,739) (80,955) (52,329)
Dividends on participating securities (258) (88) (779) (262)
Net income (loss) attributable to common stockholders $ (6,259) $ (1,528) $ (11,741) $ 2,527
Denominator:        
Basic weighted average shares of common stock outstanding (shares) 59,355,613 46,848,675 55,818,731 42,322,380
Diluted weighted average shares of common stock outstanding (shares) 59,934,008 47,068,929 56,415,082 42,538,744
Basic and diluted net income per weighted average share of common stock        
Distributable Earnings (dollars per share) $ 0.50 $ 0.40 $ 1.45 $ 1.24
Undistributed income (loss) (dollars per share) (0.11) (0.03) (0.21) 0.06
Basic and diluted net income per share of common stock (in dollars per share) $ 0.39 $ 0.37 $ 1.24 $ 1.30
RSUs [Member]        
Basic and diluted net income per weighted average share of common stock        
Unvested securities excluded from earnings per share calculation 578,395   596,351