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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

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