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Information about Stock Options Outstanding (Detail) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, Exercise price $ 10.88 $ 14.78 $ 20.63 $ 20.51
Options outstanding, No. of Shares 229      
Option currently exercisable, Exercise price $ 10.97 $ 15.16 $ 20.57  
Option currently exercisable, No. of Shares 227      
Range One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, No. of Shares 12      
Options outstanding, Weighted average remaining contractual life 5 years 10 months 13 days      
Option currently exercisable, No. of Shares 10      
Range One | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, Exercise price $ 5      
Option currently exercisable, Exercise price $ 5      
Range Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, No. of Shares 217      
Options outstanding, Weighted average remaining contractual life 1 year 11 months 4 days      
Option currently exercisable, No. of Shares 217      
Range Two | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, Exercise price $ 5      
Option currently exercisable, Exercise price 5      
Range Two | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, Exercise price 50      
Option currently exercisable, Exercise price 50      
Range Three | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, Exercise price 50      
Option currently exercisable, Exercise price 50      
Range Three | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options outstanding, Exercise price 100      
Option currently exercisable, Exercise price $ 100