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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the fiscal years ended December 31 were as follows:
|  | 2020 |  |  | 2019 |
Balance as of January 1 |  | $ | 719,934 |  |  | $ | 715,644 |
Goodwill resulting from business combination - ITG |  |  | 188,253 |  |  |  | — |
Goodwill resulting from business combination - DMS Disaster Consultants |  |  | — |  |  |  | (50 | )
Goodwill resulting from business combination - We Are Vista |  |  | — |  |  |  | (370 | )
Goodwill resulting from business combination - Olson (1) |  |  | — |  |  |  | 3,047 |
Effect of foreign currency translation |  |  | 1,726 |  |  |  | 1,663 |
Balance as of December 31 |  | $ | 909,913 |  |  | $ | 719,934 |
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.
Schedule of Other Intangibles | Other intangibles consisted of the following at December 31:
|  | 2020 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |
Customer-related |  | $ | 142,849 |  |  | $ | (83,137 | ) |  | $ | 59,712 |
Developed technology |  |  | 733 |  |  |  | (653 | ) |  |  | 80 |
Total amortizable intangible assets |  |  | 143,582 |  |  |  | (83,790 | ) |  |  | 59,792 |
Intangible with indefinite life |  |  | 95 |  |  |  | — |  |  |  | 95 |
Total other intangible assets |  | $ | 143,677 |  |  | $ | (83,790 | ) |  | $ | 59,887 |
|  | 2019 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |
Customer-related |  | $ | 95,038 |  |  | $ | (69,425 | ) |  | $ | 25,613 |
Developed technology |  |  | 733 |  |  |  | (612 | ) |  |  | 121 |
Total amortizable intangible assets |  |  | 95,771 |  |  |  | (70,037 | ) |  |  | 25,734 |
Intangible with indefinite life |  |  | 95 |  |  |  | — |  |  |  | 95 |
Total other intangible assets |  | $ | 95,866 |  |  | $ | (70,037 | ) |  | $ | 25,829 |
Schedule of Estimated Future Amortization Expense Relating to Intangible Assets | The estimated future amortization expense relating to intangible assets is as follows:
Year ending December 31, |  |  |  |
2021 |  | $ | 12,049 |
2022 |  |  | 11,727 |
2023 |  |  | 11,339 |
2024 |  |  | 10,856 |
2025 |  |  | 6,904 |
Thereafter |  |  | 6,917 |
Total |  | $ | 59,792 |

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