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Equity-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]    
Stock options $ 700 $ 441
Share based compensation 1,205 480
Time Based Restricted Stock
   
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]    
Restricted stock 214  
Performance Based Restricted Stock
   
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]    
Restricted stock 171  
Equity Incentive Plan
   
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]    
Share based compensation 1,085 441
Director
   
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]    
Share based compensation $ 120 $ 39