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Net Income per Share - Basic and Diluted Net Income (Loss) per Share of Common Stock Using Two-Class Method (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Numerator:    
Net income $ 11,932 $ 9,093
Preferred dividends (1,860)  
Net income available to common stockholders 10,072 9,093
Dividends declared on common stock (14,748) (8,224)
Dividends on participating securities (195) (168)
Net income (loss) attributable to common stockholders $ (4,871) $ 701
Denominator:    
Weighted average shares of common stock outstanding 30,105,939 20,966,426
Basic and diluted net income (loss) per weighted average share of common stock    
Distributable Earnings $ 0.49 $ 0.40
Undistributed income (loss) $ (0.16) $ 0.03
Basic and diluted net income (loss) per share of common stock $ 0.33 $ 0.43