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Net Income (Loss) per Share - Basic and Diluted Net Income per Share of Common Stock Using Two-Class Method (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:                      
Net income $ 15,864 $ 12,900 $ 11,789 $ 11,932 $ 8,968 $ 12,211 $ 9,910 $ 9,093 $ 52,485 $ 40,181 $ 25,882
Preferred dividends                 (7,440) (3,079) 0
Net income available to common stockholders 14,004 11,040 9,929 10,072 7,108 10,992 9,910 9,093 45,045 37,102 25,882
Dividends declared on common stock                 (59,008) (35,899) (30,494)
Dividends on participating securities                 (798) (628) (431)
Net income (loss) attributable to common stockholders                 $ (14,761) $ 575 $ (5,043)
Denominator:                      
Basic weighted average shares of common stock outstanding 36,886,619 36,883,002 36,880,410 30,105,939 27,297,600 20,571,478 20,570,616 20,561,032 35,212,211 22,259,386 18,840,954
Diluted weighted average shares of common stock outstanding 37,390,369 37,379,469 37,373,885 30,480,689 27,608,787 20,992,312 20,991,450 20,966,426 35,679,755 22,648,819 19,089,578
Basic and diluted net income (loss) per weighted average share of common stock                      
Distributable Earnings                 $ 1.68 $ 1.61 $ 1.62
Undistributed income (loss)                 $ (0.42) $ 0.03 $ (0.27)
Basic and diluted net income (loss) per share of common stock (in dollars per share) $ 0.37 $ 0.29 $ 0.27 $ 0.33 $ 0.26 $ 0.52 $ 0.47 $ 0.43 $ 1.26 $ 1.64 $ 1.35