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Business Changes and Developments - Additional Information (Details) $ in Thousands, R$ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 18, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Nov. 30, 2018 | Dec. 31, 2017 BRL (R$) seat | Dec. 31, 2017 USD ($) seat
Business Acquisition [Line Items] |  |  |  |  |  |  |
Asset Acquisition, Contingent Consideration, Liability |  | $ 4,463 |  |  |  |  |
Asset Acquisition, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  | 3,971 |  |  |  |  |
Proceeds from Sale of Business | $ 34,842 | 0 | $ 34,354 | $ 0 |  |  |
Business Combination, Contingent Consideration, Asset | $ 488 |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | 0 | 7,808 | 0 |  |  |
Special Charges |  | 5,012 | 25,437 | 8,100 |  |  |
Amortization of Intangible Assets |  | 9,199 | 9,793 | 11,640 |  |  |
Goodwill |  | 131,387 |  | 160,961 |  |  | $ 134,231
Impairment of Goodwill |  |  | 7,107 |  |  |  |
Goodwill, Impairment Loss, Net of Tax |  |  | 3,694 |  |  |  |
Institutional Asset Management [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  |  |  | 14.00% |  |
Goodwill |  | 3,396 |  |  |  |  |
Investment Management [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  | 7,808 |  |  |  |
Special Charges |  | 0 | 11,037 | 8,100 |  |  |
G5 [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Held-to-maturity Securities, Redemption Value | R$ |  |  |  |  |  | R$ 60 |
Company Seats on Board | seat |  |  |  |  |  | 1 | 1
Total Seats on Board | seat |  |  |  |  |  | 6 | 6
Debt Securities, Held-to-maturity |  | 9,717 |  |  |  |  | $ 10,995
Debt Securities, Held-to-maturity, Fair Value | R$ |  |  |  |  |  | R$ 37 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 16,266 |  |  |  |
Evercore Trust Company [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets Deconsolidated |  |  | 28,523 |  |  |  |
Liabilities Deconsolidated |  | 0 | 1,489 | $ 0 |  |  |
Special Charges |  |  | 3,930 |  |  |  |
Other Income [Member] | Evercore Trust Company [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  | 7,808 |  |  |  |
Special Charges [Member] | Investment Management [Member] | Institutional Asset Management [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Impairment of Goodwill |  |  | 7,107 |  |  |  |
Goodwill [Member] | Evercore Trust Company [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets Deconsolidated |  |  | $ 28,442 |  |  |  |
PCA [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Issuance of Noncontrolling Interest |  | $ 770 |  |  |  |  |

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