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Reconciliation of Statutory Tax Rate to Effective Tax Rate (Detail)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Income Taxes [Line Items]    
Federal statutory rate 34.00% 34.00%
State statutory rate, net of Federal tax effect 7.20% 7.20%
Differences in taxable (loss) income from GAAP income (20.50%) (17.40%)
Dividends paid deduction (10.70%) (22.60%)
Effective Tax Rate 10.00% 1.20%