Condensed Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 492,303	$ 415,379
Cash segregated under regulatory requirements	244,230	220,735
Securities owned	58,547	57,525
Marketable securities	303	14,228
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers	1,140,121	551,445
Accrued commissions and other receivables, net	689,045	778,415
Loans, forgivable loans and other receivables from employees and partners, net	401,633	315,590
Fixed assets, net	218,654	204,841
Investments	40,169	40,349
Goodwill	553,688	553,745
Other intangible assets, net	291,339	303,224
Receivables from related parties	14,246	14,273
Other assets	450,007	446,371
Total assets	4,594,285	3,916,120
Liabilities, Redeemable Partnership Interest, and Equity
Short-term borrowings	3,546	4,962
Repurchase agreements	2,089
Securities loaned		13,902
Accrued compensation	212,561	215,085
Payables to broker-dealers, clearing organizations, customers and related broker-dealers	988,329	416,566
Payables to related parties	45,750	72,497
Accounts payable, accrued and other liabilities	1,197,615	1,283,046
Notes payable and other borrowings	1,318,490	1,142,687
Total liabilities	3,768,380	3,148,745
Commitments, contingencies and guarantees (Note 20)
Redeemable partnership interest	23,280	23,638
Stockholders’ equity:
Additional paid-in capital	2,317,706	2,271,947
Treasury stock, at cost: 50,527 and 50,525 shares of Class A common stock at each of September 30, 2020 and December 31, 2019, respectively	(315,313)	(315,308)
Retained deficit	(1,237,657)	(1,241,754)
Accumulated other comprehensive income (loss)	(39,405)	(33,102)
Total stockholders’ equity	729,448	685,826
Noncontrolling interest in subsidiaries	73,177	57,911
Total equity	802,625	743,737
Total liabilities, redeemable partnership interest, and equity	4,594,285	3,916,120
Class A Common Stock [Member]
Stockholders’ equity:
Common stock value	3,658	3,584
Class B Common Stock [Member]
Stockholders’ equity:
Common stock value	$ 459	$ 459