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Revenue - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Revenue from Contracts with Customers [Line Items] |  |
Contract with Customer, Liability, Revenue Recognized | $ 15,115 | $ 16,468
Period in Which Performance Obligations Under Client Arrangements Settled | 1 year |
Underwriting Fees [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Reimbursement Revenue |  | 4,680
Professional Fees [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Reimbursable Expense |  | 2,340
Travel and Related Expenses [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Reimbursable Expense |  | 460
Communications and Information Services [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Reimbursable Expense |  | 476
Other Operating Expenses [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Reimbursable Expense |  | 1,404
Investment Banking [Member] | Advisory Fees [Member] |  |
Revenue from Contracts with Customers [Line Items] |  |
Revenue, Variable Consideration Recognized |  | $ 3,374

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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