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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |
Balance as of January 1 |  |  | $ 719,934 | $ 715,644
Effect of foreign currency translation |  |  | 1,726 | 1,663
Balance as of December 31 |  |  | 909,913 | 719,934
ITG |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from business combination |  | $ 188,300 | $ 188,253 |
DMS Disaster Consultants |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from business combination |  |  |  | (50)
Vista Limited |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from business combination |  |  |  | (370)
Olson |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from business combination | [1] |  |  | $ 3,047
[1] | In 2019, the Company recorded changes to goodwill representing an immaterial correction of an error for income tax balances related to acquired assets and liabilities from the business combination that occurred in 2014. These balances were not significant to our previously reported financial position.

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