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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Operating Loss Carryforwards [Line Items]    
Effective tax rates 34.00%  
Additional bad debt deductions provided by Federal income tax laws $ 2,250  
Deferred tax liability not recorded 765  
Corporate income tax rate 34.00%  
Net operating loss carryforwards 1,904 6,628
Operating loss carryforwards expire dates 2024 to 2032  
Alternative minimum tax credit carryforwards 60  
Carryforwards utilize limit before the stock offering closed 163  
Unutilized operating loss carryforward expire 20,342  
Reduced deferred tax assets and the valuation allowance 3,122 8,629
Unrecognized tax benefits recorded $ 0 $ 0
Significant change in unrecognized tax benefits not expected, period 12 months