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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 23, 2019	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Summary of Significant Accounting Policies [Line Items]
Amount of off balance sheet settlement funds		$ 246,800	$ 274,000
Operating lease right-of-use assets		41,243	57,382
Operating lease liability		$ 53,396	61,815
Accounting Standards Update 2016-02
Summary of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets				$ 63,300
Operating lease liability				$ 68,600
Level 2 | Senior Notes | 5.750% Senior Notes due 2026
Summary of Significant Accounting Policies [Line Items]
Stated interest rate (percentage)		5.75%
Fair value of long-term debt		$ 424,500	432,000
India Payment Technology and Services Company
Summary of Significant Accounting Policies [Line Items]
Payments to acquire investment interest	$ 18,300
Percentage of voting interests acquired	30.00%
India Payment Technology and Services Company | Other Noncurrent Assets
Summary of Significant Accounting Policies [Line Items]
Equity method investment, carrying amount		$ 19,300	$ 18,500
Software for resale | Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		5 years
Software for resale | Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		10 years
Software for internal use | Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		3 years
Software for internal use | Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		8 years
Other intangible assets | Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		4 years
Other intangible assets | Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		20 years

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