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Business Combinations - Summary of Allocation Preliminary Purchase Price (Details) - USD ($) $ in Thousands | Jul. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 819,069 | $ 660,040
Hermes |  |  |
Business Acquisition [Line Items] |  |  |
Cash and Cash Equivalents | $ 175,800 |  |
Other Current Assets | 53,700 |  |
Goodwill | 161,200 |  |
Intangible Assets | 271,700 |  |
Other Long-Term Assets | 34,700 |  |
Less: Long-Term Deferred Tax Liability, net | (20,900) |  |
Less: Liabilities Acquired | (162,300) |  |
Less: Fair Value of Redeemable Noncontrolling Interest in Subsidiary | (169,600) |  |
Total Purchase Price Consideration | 344,300 |  |
Receivables | 31,900 |  |
Property and equipment | 11,200 |  |
Accrued compensation | 130,300 |  |
Hermes | Trade Name |  |  |
Business Acquisition [Line Items] |  |  |
Indefinite-lived intangible assets | 49,100 |  |
Hermes | Investment Advisory Contracts [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Indefinite-lived intangible assets | 130,200 |  |
Hermes | Customer Relationships |  |  |
Business Acquisition [Line Items] |  |  |
Customer relationships | $ 92,400 |  |
Weighted-average useful life | 8 years 5 months |  |

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