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Net Income per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Numerator:    
Net income $ 17,580 $ 11,932
Preferred dividends (1,860) (1,860)
Net income available to common stockholders 15,720 10,072
Dividends declared on common stock (14,850) (14,748)
Dividends on participating securities (86) (195)
Net income (loss) attributable to common stockholders $ 784 $ (4,871)
Denominator:    
Basic weighted average shares of common stock outstanding 37,122,842 30,105,939
Diluted weighted average shares of common stock outstanding 37,341,050 30,480,689
Basic and diluted net income (loss) per weighted average share of common stock    
Distributable Earnings $ 0.40 $ 0.49
Undistributed income (loss) $ 0.02 $ (0.16)
Basic and diluted net income (loss) per share of common stock (in dollars per share) $ 0.42 $ 0.33