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Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross |  | $ 923,199 | $ 1,050,372
Accumulated Amortization |  | 891,422 | 922,554
Effects of Foreign Currency Translation |  |  | 3,911
Net |  | $ 31,777 | 123,907
Weighted Average Remaining Amortization Period in Years | 3 years | 2 years |
Client relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross |  | $ 701,802 | 803,641
Accumulated Amortization |  | 701,518 | 720,886
Effects of Foreign Currency Translation |  |  | 3,126
Net |  | $ 284 | 79,629
Weighted Average Remaining Amortization Period in Years | 3 years 3 months 18 days | 1 year 4 months 24 days |
Trademarks and domain names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross |  | $ 200,300 | 225,177
Accumulated Amortization |  | 169,545 | 181,050
Effects of Foreign Currency Translation |  |  | 785
Net |  | $ 30,755 | 43,342
Weighted Average Remaining Amortization Period in Years | 2 years 4 months 24 days | 2 years |
Patented technologies |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross |  | $ 19,600 | 19,600
Accumulated Amortization |  | 19,600 | 19,600
Effects of Foreign Currency Translation |  |  | 0
Net |  | $ 0 | 0
Weighted Average Remaining Amortization Period in Years | 0 years | 0 years |
Covenants not to compete |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross |  | $ 1,497 | 1,954
Accumulated Amortization |  | 759 | 1,018
Effects of Foreign Currency Translation |  |  | 0
Net |  | $ 738 | $ 936
Weighted Average Remaining Amortization Period in Years | 2 years | 1 year 9 months 18 days |

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- Definition Finite Lived Intangible Assets, Accumulated Foreign Currency Gain (Loss) + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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