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Preferred Stock - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 05, 2008
Series A Preferred Stock [Member]
Class of Stock [Line Items]        
Issuance of Preferred stock   7,225   7,225
Preferred stock value   $ 7,120   $ 7,225
Dividend rate 5.00%      
Future dividend rate 9.00%      
Liquidation preference $ 1      
Cumulative deferred dividend payments   466 90  
Proceeds from stock offering 3,000      
Deferred dividends totaling 801      
Increase in common stockholders' equity $ 4,960