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AdvisorEngine - Financial Interests carrying value of the Company's financial interests (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Total net carrying value   $ 28,172
Advisor Engine [Member]    
Unsecured convertible note, Amortized Cost plus Accrued Interest 2,126
Unsecured non-convertible note, Amortized Cost, plus Accrued Interest 31,184
Subtotal - notes receivable: Amortized Cost, plus Accured Interest 33,310
Preferred stock, Amortized Cost, plus Accrued Interest 25,000
Total amortized cost, plus accrued interest 58,310
Unsecured convertible note, Net Carrying Value   2,126
Unsecured non-convertible note, Net Carrying Value   26,046
Subtotal - Notes receivable:, Net Carrying Value 28,172
Preferred stock, Net Carrying Value  
Total net carrying value $ 28,172