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Stock Compensation Plans - Summary of Information about Stock Options Outstanding (Detail) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options Outstanding 10,435,990    
Number of Options, Exercisable 8,449,389 7,936,659 6,946,677
July 27, 2011 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 12.50    
Number of Options Outstanding 907,101    
Weighted-Average Remaining Contractual Life 2 years    
Number of Options, Exercisable 907,101    
December 20, 2012 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 14.50    
Number of Options Outstanding 1,009,819    
Weighted-Average Remaining Contractual Life 3 years    
Number of Options, Exercisable 1,009,819    
December 19, 2013 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 15.90    
Number of Options Outstanding 1,991,804    
Weighted-Average Remaining Contractual Life 4 years    
Number of Options, Exercisable 1,991,804    
December 18, 2014 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 15.80    
Number of Options Outstanding 1,270,581    
Weighted-Average Remaining Contractual Life 5 years    
Number of Options, Exercisable 1,270,581    
December 17, 2015 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 13.64    
Number of Options Outstanding 1,191,845    
Weighted-Average Remaining Contractual Life 1 year    
Number of Options, Exercisable 1,191,845    
December 15, 2016 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 16.48    
Number of Options Outstanding 1,202,808    
Weighted-Average Remaining Contractual Life 2 years    
Number of Options, Exercisable 1,202,808    
December 21, 2017 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 17.60    
Number of Options Outstanding 799,832    
Weighted-Average Remaining Contractual Life 3 years    
Number of Options, Exercisable 533,168    
December 20, 2018 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 13.69    
Number of Options Outstanding 1,016,800    
Weighted-Average Remaining Contractual Life 4 years    
Number of Options, Exercisable 338,930    
March 4, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 13.51    
Number of Options Outstanding 10,000    
Weighted-Average Remaining Contractual Life 4 years 2 months 12 days    
Number of Options, Exercisable 3,333    
December 19, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise Price $ 14.98    
Number of Options Outstanding 1,035,400    
Weighted-Average Remaining Contractual Life   5 years