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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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- Definition

Period in Which Performance Obligations Under Client Arrangements Settled

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Revenue, Variable Consideration Recognized

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[Line Items] for Revenue from Contracts with Customers [Table]

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No definition available.

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

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- Definition

Cost associated with reimbursable income. This occurs when a services entity incurs expenses on behalf of the client and passes through the cost of reimbursable expenses to a client.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 45
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=68075638&loc=d3e60722-111653

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