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Share-Based Compensation - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended
Sep. 02, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense recognized   $ 4,631,000    
Unrecognized stock-based compensation expense   6,500,000    
Unrecognized stock-based compensation expense, weighted-average recognition period   1 year 9 months 18 days    
Upon the acceleration of vesting of all outstanding but unvested restricted stock awards or units that had been previously granted to certain of the Company's former executives as of the respective effective dates of termination
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense recognized     3,300,000 1,900,000
Deferred Stock Units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred stock units granted 83,337      
Weighted average grant date fair value, granted $ 6.66     $ 6.66
Share-based compensation expense recognized   600,000 600,000 600,000
2010 Incentive Award Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares to be issued   2,898,613    
Incentive plan and award expiration date   Oct. 13, 2020    
Shares available for future issuance   1,575,926    
2010 Incentive Award Plan | Restricted Stock Units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of restricted stock vested   $ 3,300,000    
Deferred stock units granted   396,000    
Weighted average grant date fair value, granted   $ 10.76