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Stock-Based Compensation - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares of the Company's common stock 1,785,000    
Outstanding restricted shares 295,075    
Compensation expense $ 947,000 $ 569,000 $ 327,000
Stock-based compensation expense related to stock options 97,000 216,000 397,000
Options granted 0 0 0
Unrecognized compensation cost related to nonvested share 0    
Stock based compensation grants 0 0 0
Unearned compensation related to restricted stock $ 1,608,000 $ 1,679,000 $ 1,230,000
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option granted 5 years    
Minimum [Member] | Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option granted 3 years    
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option granted 10 years    
Maximum [Member] | Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option granted 5 years