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Revenue - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Revenue from Contracts with Customers [Line Items] |  |
Contract with Customer, Liability, Revenue Recognized | $ 3,740 | $ 8,984
Period in Which Performance Obligations Under Client Arrangements Settled |  | 1 year
Underwriting Fees [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Reimbursement Revenue | 116 | $ 3,913
Professional Fees [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Cost of Reimbursable Expense | 34 | 1,957
Travel and Related Expenses [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Cost of Reimbursable Expense | 16 | 391
Communications and Information Services [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Cost of Reimbursable Expense | 16 | 391
Other Operating Expenses [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Cost of Reimbursable Expense | 50 | 1,174
Investment Banking [Member] | Advisory Fees [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Revenue, Variable Consideration Recognized | $ 50,829 | $ 50,829

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