Acquisitions of Businesses - Schedule of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Oct. 18, 2021	Oct. 01, 2021	Apr. 20, 2021	Apr. 01, 2021
Assets acquired:
Goodwill	$ 671,431	$ 672,381
Inposia
Assets acquired:
Goodwill						$ 26,500
Inposia | Fair Value
Assets acquired:
Cash and cash equivalents						1,264
Trade accounts receivable						1,767
Other current assets						268
Operating lease right-of-use assets						928
Property and equipment						98
Developed technology, customer relationships, and other intangibles						14,269
Goodwill						26,520
Other noncurrent assets						35
Total assets acquired						45,149
Liabilities assumed:
Trade payables and accrued expenses						1,478
Deferred revenue						810
Other liabilities, noncurrent						106
Operating lease liabilities						928
Deferred tax liability						4,400
Total liabilities assumed						7,722
Net assets acquired						$ 37,427
Davo Technologies LLC
Assets acquired:
Goodwill					$ 51,900
Davo Technologies LLC | Fair Value
Assets acquired:
Cash and cash equivalents					198
Funds held from customers					12,464
Trade accounts receivable					119
Other current assets					58
Operating lease right-of-use assets					46
Developed technology, customer relationships, and other intangibles					4,651
Goodwill					51,911
Other noncurrent assets					2
Total assets acquired					69,449
Liabilities assumed:
Accrued expenses					117
Deferred revenue					75
Operating lease liabilities					46
Customer fund obligations					12,464
Total liabilities assumed					12,702
Net assets acquired					$ 56,747
Track1099 LLC
Assets acquired:
Goodwill				$ 43,000
Track1099 LLC | Fair Value
Assets acquired:
Prepaid and other current assets	2
Developed technology, customer relationships, and other intangibles	5,850
Goodwill	42,962
Total assets acquired	48,814
Liabilities assumed:
Current liabilities	1
Deferred revenue	9
Total liabilities assumed	10
Net assets acquired	48,804
CrowdReason LLC and CorrelationAdvisors
Assets acquired:
Goodwill			$ 25,400
CrowdReason LLC and CorrelationAdvisors | Fair Value
Assets acquired:
Current assets	1,426
Developed technology, customer relationships, and other intangibles	10,300
Goodwill	25,415
Total assets acquired	37,141
Liabilities assumed:
Current liabilities	101
Deferred revenue & contract liabilities	676
Total liabilities assumed	777
Net assets acquired	$ 36,364