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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | The following table presents revenue recognized by the Company for the years ended December 31, 2020, 2019 and 2018:
|  |  | For the Years Ended December 31,
|  |  |  |  | 2020 |  | 2019 |  | 2018
Investment Banking: |  |  |  |  |  |  |  |  |
Advisory Fees |  |  |  |  | $ | 1,755,273 |  |  | $ | 1,653,585 |  |  | $ | 1,743,473 |
Underwriting Fees |  |  |  |  | 276,191 |  |  | 89,681 |  |  | 71,691 |
Commissions and Related Fees |  |  |  |  | 205,767 |  |  | 189,506 |  |  | 200,015 |
Total Investment Banking |  |  |  |  | $ | 2,237,231 |  |  | $ | 1,932,772 |  |  | $ | 2,015,179 |
Investment Management: |  |  |  |  |  |  |  |  |
Asset Management and Administration Fees: |  |  |  |  |  |  |  |  |
Wealth Management |  |  |  |  | $ | 53,069 |  |  | $ | 48,083 |  |  | $ | 44,875 |
Institutional Asset Management |  |  |  |  | 1,328 |  |  | 2,528 |  |  | 3,371 |
Total Investment Management |  |  |  |  | $ | 54,397 |  |  | $ | 50,611 |  |  | $ | 48,246 |
Contract with Customer, Asset and Liability [Table Text Block] | The change in the Company’s contract assets and liabilities during the periods primarily reflects timing differences between the Company’s performance and the client’s payment. The Company’s receivables, contract assets and deferred revenue (contract liabilities) for the years ended December 31, 2020 and 2019 are as follows:
| For the Year Ended December 31, 2020
| Receivables (Current)(1) |  | Receivables (Long-term)(2) |  | Contract Assets (Current)(3) |  | Contract Assets (Long-term)(2) |  | Deferred Revenue (Current Contract Liabilities)(4) |  | Deferred Revenue (Long-term Contract Liabilities)(5)
Balance at January 1, 2020 | $ | 296,355 |  |  | $ | 63,554 |  |  | $ | 31,525 |  |  | $ | 2,504 |  |  | $ | 2,492 |  |  | $ | 615 |
Increase (Decrease) | 71,991 |  |  | 7,421 |  |  | (2,198) |  |  | 2,779 |  |  | 6,881 |  |  | (468) |
Balance at December 31, 2020 | $ | 368,346 |  |  | $ | 70,975 |  |  | $ | 29,327 |  |  | $ | 5,283 |  |  | $ | 9,373 |  |  | $ | 147 |
| For the Year Ended December 31, 2019
| Receivables (Current)(1) |  | Receivables (Long-term)(2) |  | Contract Assets (Current)(3) |  | Contract Assets (Long-term)(2) |  | Deferred Revenue (Current Contract Liabilities)(4) |  | Deferred Revenue (Long-term Contract Liabilities)(5)
Balance at January 1, 2019 | $ | 309,075 |  |  | $ | 60,948 |  |  | $ | 2,833 |  |  | $ | 541 |  |  | $ | 4,016 |  |  | $ | 1,731 |
Increase (Decrease) | (12,720) |  |  | 2,606 |  |  | 28,692 |  |  | 1,963 |  |  | (1,524) |  |  | (1,116) |
Balance at December 31, 2019 | $ | 296,355 |  |  | $ | 63,554 |  |  | $ | 31,525 |  |  | $ | 2,504 |  |  | $ | 2,492 |  |  | $ | 615 |
(1)Included in Accounts Receivable on the Consolidated Statements of Financial Condition. (2)Included in Other Assets on the Consolidated Statements of Financial Condition. (3)Included in Other Current Assets on the Consolidated Statements of Financial Condition. (4)Included in Other Current Liabilities on the Consolidated Statements of Financial Condition. (5)Included in Other Long-term Liabilities on the Consolidated Statements of Financial Condition.
Accounts Receivable, Allowance for Credit Loss [Table Text Block] | The allowance for credit losses for the years ended December 31, 2020 and 2019 is as follows:
|  |  | For the Years Ended December 31, |  |
|  |  |  |  | 2020 |  | 2019 |  |
Beginning Balance(1) |  |  |  |  | $ | 9,191 |  |  | $ | 6,037 |  |  |
Bad debt expense |  |  |  |  | 6,878 |  |  | 10,451 |  |  |
Write-offs, foreign currency translation and other adjustments |  |  |  |  | (10,697) |  |  | (8,607) |  |  |
Ending Balance |  |  |  |  | $ | 5,372 |  |  | $ | 7,881 |  |  |
(1)Beginning Balance for the year ended December 31, 2020 includes the cumulative-effect adjustment of $1,310, which reflects the increase in the Company's Allowance for Doubtful Accounts as a result of the use of the current expected credit loss model related to the adoption of ASU 2016-13 on January 1, 2020. See Notes 2 and 3 for further information.
Accounts Receivable, Noncurrent, Credit Quality Indicator [Table Text Block] | For long-term accounts receivable and long-term contract assets, the Company monitors clients’ creditworthiness based on collection experience and other internal metrics. The following table presents the Company’s long-term accounts receivable and long-term contract assets from the Company's private and secondary fund advisory businesses as of December 31, 2020, by year of origination:
| Amortized Cost Basis by Origination Year
| 2020 |  | 2019 |  | 2018 |  | 2017 |  |  |  |  |  |  |  | Total
Long-term Accounts Receivable and Long-Term Contract Assets | $ | 47,466 |  |  | $ | 19,538 |  |  | $ | 8,478 |  |  | $ | 776 |  |  |  |  |  |  |  |  | $ | 76,258 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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