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Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Mar. 01, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 678,793 | $ 609,457
Client relationships |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets, useful life | 3 years 6 months |  |
Trademarks |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets, useful life | 3 years 6 months |  |
Acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Total cash consideration | $ 214,984 |  |
Consideration transferred to acquire business | 214,984 |  |
Cash and cash equivalents | 40,794 |  |
Accounts receivable and other current assets | 88,529 |  |
Other assets | 9,367 |  |
Fixed assets and capitalized software | 40,957 |  |
Accounts payable | (31,163) |  |
Accrued liabilities | (40,713) |  |
Contract liabilities | (27,075) |  |
Other current liabilities | (6,733) |  |
Deferred tax liabilities | (42,121) |  |
Other liabilities | (15,505) |  |
Total identifiable net assets | 143,053 |  |
Goodwill | 71,931 |  |
Total net assets acquired | 214,984 |  |
Acquisition | Client relationships |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 101,839 |  |
Acquisition | Trademarks |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | $ 24,877 |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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