XML 46 R35.htm IDEA: XBRL DOCUMENT v2.4.0.6
Additional Information Regarding Vested and Unvested Options Outstanding (Detail) (USD $)
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 6.74 $ 7.35 $ 7.43 $ 7.57
Option outstanding, vested 828,899      
Option outstanding, unvested 640,948 352,049    
Option outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 190 days      
Options Exercisable 828,899 [1]   706,350  
Options Exercisable, Weighted Average Exercise Price $ 8.55 [1]   $ 9.72  
Exercise Price $ 2.97 - $5.99
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 4.06      
Option outstanding, vested 350,498      
Option outstanding, unvested 635,806      
Option outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 245 days      
Options Exercisable 350,498 [1]      
Options Exercisable, Weighted Average Exercise Price $ 3.48 [1]      
Exercise Price $ 2.97 - $5.99 | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 2.97      
Exercise Price $ 2.97 - $5.99 | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 5.99      
Exercise Price $ 6.00 - $9.99
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 7.22      
Option outstanding, vested 27,800      
Option outstanding, unvested 4,800      
Option outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 201 days      
Options Exercisable 27,800 [1]      
Options Exercisable, Weighted Average Exercise Price $ 7.28 [1]      
Exercise Price $ 6.00 - $9.99 | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 6.00      
Exercise Price $ 6.00 - $9.99 | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 9.99      
Exercise Price $10.00 - $12.99
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 11.23      
Option outstanding, vested 310,100      
Option outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 230 days      
Options Exercisable 310,100 [1]      
Options Exercisable, Weighted Average Exercise Price $ 11.23 [1]      
Exercise Price $10.00 - $12.99 | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 10.00      
Exercise Price $10.00 - $12.99 | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 12.99      
Exercise Price $13.00 - $17.99
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 15.09      
Option outstanding, vested 121,001      
Option outstanding, unvested 342      
Option outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 51 days      
Options Exercisable 121,001 [1]      
Options Exercisable, Weighted Average Exercise Price $ 15.09 [1]      
Exercise Price $13.00 - $17.99 | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 13.00      
Exercise Price $13.00 - $17.99 | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 17.99      
Exercise Price $18.00 - $18.84
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 18.06      
Option outstanding, vested 19,500      
Option outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 215 days      
Options Exercisable 19,500 [1]      
Options Exercisable, Weighted Average Exercise Price $ 18.06 [1]      
Exercise Price $18.00 - $18.84 | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 18.00      
Exercise Price $18.00 - $18.84 | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option outstanding, Weighted Average Exercise Price $ 18.84      
[1] The weighted average remaining contractual life of the options that were exercisable as of June 30, 2012 was 4.56 years.