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Share-based Compensation - Schedule of Share-Based Compensation by Line Item in Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense $ 16,207 $ 21,540 $ 18,930
Stock options [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 2,571 4,054 3,061
Time-based Restricted Stock Awards and Stock Units [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 8,485 11,084 7,265
Performance-based Restricted Stock Awards and Stock Units [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense     1,998
Market-based Restricted Stock Units [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 3,509 4,733 5,256
Stock purchase plan [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 1,642 1,669 1,350
Cost of sales [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 705 715 522
Sales and marketing [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 3,620 2,512 1,802
General and administrative [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense 10,624 16,872 15,197
Research and development [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Allocated share based compensation expense $ 1,258 $ 1,441 $ 1,409