Nature of Business and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 23, 2019	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies [Line Items]
Other current assets		$ 24,200		$ 14,260
Other current liabilities		76,971		61,688
Settlement assets		391,039		32,256
Settlement liabilities		368,719		31,605
Amount of off balance sheet settlement funds		$ 274,000		256,500
Goodwill measurement period		1 year
Right-of-use assets		$ 57,382		0
Operating lease liability		$ 61,815
Accounting Standards Update 2016-02
Summary of Significant Accounting Policies [Line Items]
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		$ 432,000		395,000
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%
Equity method investments, initial amount recorded	$ 18,500
Software for resale | Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		5 years
Software for internal use | Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		1 year
Software for internal use | Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		10 years
Other intangible assets | Minimum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		3 years
Other intangible assets | Maximum
Summary of Significant Accounting Policies [Line Items]
Estimated useful life		20 years
Prior Period Adjustment
Summary of Significant Accounting Policies [Line Items]
Other current assets				(32,300)
Other current liabilities				(31,600)
Settlement assets				32,300
Settlement liabilities				$ 31,600