Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2018		Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued bonuses	$ 20,553		$ 15,119
Accrued payroll and severance	15,932		18,500
Accrued taxes	85,346		63,698
Accrued commissions/rebates	60,593		47,198
Other	79,170		93,957
Total	$ 261,594	[1]	$ 238,472

[1] Reflects the impact of the Company's adoption of ASC 606 and related cost capitalization guidance, which was adopted by the Company on January 1, 2018 using the modified retrospective transition method. The adoption of ASC 606 resulted in an adjustment to retained earnings in our consolidated balance sheet for the cumulative effect of applying the standard, which included costs incurred to obtain a contract, as well as presentation changes in our statements of income, including the classification of certain amounts previously classified as merchant commissions and processing expense net with revenues. As a result of the application of the modified retrospective transition method, the Company's prior period results within its Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect ASC 606.