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Deferred Compensation Plan - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Percentage of salary the participants may defer 50.00%    
Percentage of cash bonuses the participants may defer 100.00%    
Maximum matching contributions per year $ 10,000    
Employer matching contributions and earnings, vesting schedule Five years    
Employer contributions to deferred compensation plan $ 687,000 $ 128,000 $ 337,000
First 3% Of The Participant's Deferred Pay
     
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Percentage of matching contribution 100.00%    
Next 2% Of The Participant's Deferred Pay
     
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Percentage of matching contribution 50.00%