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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2021 | Jan. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |  |  |
Balance as of January 1 |  |  | $ 909,913 | $ 719,934
Effect of foreign currency translation |  |  | (497) | 1,726
Balance as of December 31 |  |  | 1,046,760 | 909,913
ITG |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from business combination |  | $ 188,300 |  | $ 188,253
ESAC |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from business combination | $ 11,200 |  | 11,226 |
Creative Systems and Consulting |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from business combination |  |  | $ 126,118 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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