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Significant Accounting Policies (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2016 | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Total Assets |  |  | $ 3,370,888 |  | $ 2,598,613 | $ 2,125,667 |
Total Liabilities |  |  | 1,881,514 |  | 1,472,363 |  |
Retained Earnings |  |  | $ (798,573) |  | (558,269) |  |
Investment Banking And Investment Management Receivables Collection Periods |  |  | 90 days |  |  |  |
Placement Fees Receivables Collection Period |  |  | 180 days |  |  |  |
Private Funds Capital Raising Receivables Collection Period |  |  | 1 year |  |  |  |
Collection Period For Restructuring Transactions |  |  | 90 days |  |  |  |
Receivables Reflected in Other Assets in Excess of Period |  |  | 1 year |  |  |  |
Contract Asset Recognized For Cost of Obtaining Contract With Benefit in Excess of Period |  |  | 1 year |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | $ (1,489,374) |  | (1,126,250) | (1,007,939) | $ (796,368)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | [1] |  |  | $ 1,310 |  |  |
LP Units [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Limited Partnership Units Convertible Conversion Ratio |  | 1 | 1 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |  |  |  |
Award Vesting Period |  |  | 1 year |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 7 years |  |  |  |
Award Vesting Period |  |  | 5 years |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | $ (798,573) |  | (558,269) | $ (364,882) | $ (79,461)
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | [1] |  |  | $ 1,310 |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Total Assets |  |  | 377,878 |  | 227,885 |  |
Total Liabilities |  |  | $ 164,779 |  | $ 129,494 |  |
[1] | (2) The cumulative adjustment relates to the adoption of ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13") on January 1, 2020, for which the Company recorded an adjustment to Retained Earnings to reflect the increase in the Company's Allowance for Doubtful Accounts as a result of the use of the current expected credit loss model. See Notes 2 and 3 for further information.

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