Nature of Business - Exchange Transaction (Details)						1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	May 26, 2020 shares	Dec. 31, 2019 USD ($) shares	Jun. 12, 2019 shares	Dec. 28, 2018 USD ($) extensionTerm $ / shares shares	Aug. 10, 2018 USD ($) $ / shares shares	Sep. 30, 2014 shares	Jun. 30, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Jun. 30, 2019 shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 shares	Dec. 31, 2018 shares	Mar. 31, 2019
Debt Instrument [Line Items]
Financing receivables from affiliates | $		$ 67,153,000					$ 69,428,000	$ 67,153,000		$ 69,428,000
Investment, assumed value (in usd per share) | $ / shares					$ 10
Shares acquired (in shares)								666,667
Common Stock
Debt Instrument [Line Items]
Issuance of stock (in shares)				27,013,516		800,000	2,232		40,874	3,688	58,009
Common stock issued upon conversion of preferred stock (in shares)				5,000,000
Ben LP
Debt Instrument [Line Items]
Investment (in shares)				40,505,279	4,032,349
Shares acquired (in shares)	26,009	666,667	1,000,000									40,505,279
Percentage of Outstanding Common Units	95.60%	95.50%	90.20%	89.90%	13.90%			95.50%				89.90%	88.10%
Ben LP | Merger Consideration
Debt Instrument [Line Items]
Investment (in shares)				21,650,087
Ben LP | Exchange of Exchangeable Note
Debt Instrument [Line Items]
Investment (in shares)				14,822,843
Affiliated Entity | Ben LP | Commercial Loan
Debt Instrument [Line Items]
Financing receivables from affiliates | $				$ 182,000,000.0	$ 200,000,000.0
Notes and interest receivable | $				$ 192,500,000
Commercial loan, number of extensions | extensionTerm				2
Commercial loan, term				5 years
Commercial loan, interest rate				5.00%
Commercial loan, interest rate, due and payable monthly				0.025
Commercial loan, interest rate, due at maturity				0.025
Affiliated Entity | Ben LP | Exchangeable Note
Debt Instrument [Line Items]
Financing receivables from affiliates | $				$ 148,200,000	$ 162,900,000
Seller Trusts and Beneficient
Debt Instrument [Line Items]
Shares acquired (in shares)				40,505,279
Percentage of Outstanding Common Units				89.90%
Series B Convertible Preferred Stock
Debt Instrument [Line Items]
Issuance of stock (in shares)					5,000,000
Preferred stock, par value (in usd per share) | $ / shares					$ 0.001
Preferred stock, liquidation preference per share (in usd per share) | $ / shares					$ 10
Cash consideration | $					$ 50,000,000.0
Series B Convertible Preferred Stock
Debt Instrument [Line Items]
Common stock issued upon conversion of preferred stock (in shares)				5,000,000
Conversion price (in usd per share) | $ / shares				$ 10
Seller Trust L Bonds due 2023
Debt Instrument [Line Items]
Principal amount | $				$ 366,900,000	$ 403,200,000
Interest received | $				$ 800,000
Debt, weighted average interest rate					7.50%