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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income $ 8,968 $ 12,211 $ 9,910 $ 9,093 $ 8,669 $ 5,512 $ 6,520 $ 5,180 $ 40,181 $ 25,882 $ 10,999
Preferred dividends                 (3,079)    
Net income available to common stockholders 7,108 10,992 9,910 9,093 8,669 5,512 6,520 5,180 37,102 25,882 10,999
Dividends declared on common stock                 (35,899) (30,494) (21,507)
Dividends on participating securities                 (629) (431) (169)
Net income (loss) attributable to common stockholders                 $ 574 $ (5,043) $ (10,677)
Denominator:                      
Weighted average shares of common stock outstanding 27,297,600 20,992,312 20,991,450 20,966,426 20,989,828 19,966,594 17,684,991 17,670,787 22,648,819 18,840,954 12,679,277
Basic and diluted net income (loss) per weighted average share of common stock                      
Distributable Earnings                 $ 1.61 $ 1.62 $ 1.71
Undistributed income (loss)                 $ 0.03 $ (0.27) $ (0.84)
Basic and diluted net income (loss) per share of common stock $ 0.26 $ 0.52 $ 0.47 $ 0.43 $ 0.41 $ 0.28 $ 0.37 $ 0.29 $ 1.64 $ 1.35 $ 0.87