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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated share based compensation expense | $ 21,540 | $ 18,930 | $ 12,557
Stock options [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated share based compensation expense | 4,054 | 3,061 | 2,388
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 | 11,084 | 7,265 | 5,540
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 | 462
Market-based Restricted Stock Units [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated share based compensation expense | 4,733 | 5,256 | 2,904
Stock purchase plan [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated share based compensation expense | 1,669 | 1,350 | 1,263
Cost of sales [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated share based compensation expense | 715 | 522 | 486
Sales and marketing [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated share based compensation expense | 2,512 | 1,802 | 1,471
General and administrative [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated share based compensation expense | 16,872 | 15,197 | 9,671
Research and development [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated share based compensation expense | $ 1,441 | $ 1,409 | $ 929

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