CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net income	$ 62,375,000	$ 112,545,000	$ 978,134,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Gains on originated mortgage servicing rights	(75,704,000)	(130,301,000)	(147,789,000)
Depreciation and amortization	166,221,000	165,816,000	121,729,000
Lease impairment	7,563,000	14,363,000	0
Nasdaq Earn-out recognition	0	0	(1,108,012,000)
Provision for credit losses on the financial guarantee liability	2,634,000	1,740,000	(3,592,000)
Provision for doubtful accounts	(2,201,000)	6,645,000	6,338,000
Equity-based compensation and allocation of net income to limited partnership units and FPUs	139,747,000	138,312,000	356,345,000
Employee loan amortization	92,935,000	84,116,000	79,418,000
Deferred tax (benefit) provision	(5,195,000)	(24,499,000)	118,649,000
Non-cash changes in acquisition related earn-outs	5,170,000	(1,325,000)	415,000
Unrealized (gains) losses on loans held for sale	(26,662,000)	(712,000)	(21,259,000)
Unrealized (gains) on investments	0	0	27,825,000
Income from an equity method investment	(14,221,000)	(2,842,000)	0
Realized losses on marketable securities	0	7,470,000	(24,468,000)
Unrealized losses on marketable securities	689,000	80,657,000	(77,266,000)
Unrealized loss (gain) on non-marketable investments	3,786,000	12,888,000	(1,590,000)
Change in valuation of derivative asset	0	0	(12,475,000)
Loan originations—loans held for sale	(6,913,075,000)	(7,823,204,000)	(9,142,148,000)
Loan sales—loans held for sale	6,549,138,000	8,758,049,000	9,177,733,000
Other	1,735,000	2,172,000	3,610,000
Consolidated net income (loss), adjusted for non-cash and non-operating items	(5,065,000)	1,401,890,000	300,897,000
Changes in operating assets and liabilities:
Receivables, net	(69,309,000)	42,444,000	(191,271,000)
Loans, forgivable loans and other receivables from employees and partners	(243,258,000)	(131,604,000)	(78,493,000)
Right-of-use asset	54,141,000	(42,005,000)	41,508,000
Receivable from related parties	0	8,262,000	(8,262,000)
Other assets	(9,036,000)	8,714,000	8,858,000
Accrued compensation	(22,262,000)	(102,333,000)	(83,237,000)
Right-of-use liability	(39,746,000)	51,602,000	(34,676,000)
Accounts payable, accrued expenses and other liabilities	71,675,000	(35,333,000)	(4,399,000)
Payables to related parties	(3,101,000)	(5,294,000)	366,000
Net cash provided by (used in) operating activities	(265,961,000)	1,196,343,000	(48,709,000)
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for acquisitions, net of cash acquired and proceeds from divestitures	(99,885,000)	(64,247,000)	(69,755,000)
Proceeds from the sale of marketable securities	0	437,820,000	551,064,000
Proceeds from the exercise of redemption option	105,501,000	0	0
Purchase of marketable securities	0	(32,000)	0
Purchase of non-marketable investments	0	(2,723,000)	(8,500,000)
Purchases of fixed assets	(55,361,000)	(62,189,000)	(19,721,000)
Net cash provided by (used in) investing activities	(49,745,000)	308,629,000	453,088,000
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from warehouse facilities	6,913,075,000	7,823,204,000	9,142,148,000
Principal payments on warehouse facilities	(6,551,850,000)	(8,736,491,000)	(9,152,656,000)
Proceeds from the sale of limited partnership interests	0	0	6,898,000
Borrowing of debt	930,000,000	0	55,000,000
Repayment of debt	(930,000,000)	0	(195,000,000)
Repurchase agreements and securities loaned	0	(140,007,000)	106,729,000
Redemption and repurchase of limited partnership interests	0	0	(2,000,000)
Treasury stock repurchases	(37,428,000)	(294,802,000)	(290,538,000)
Earnings and tax distributions to limited partnership interests and other noncontrolling interests	(35,375,000)	(80,984,000)	(14,907,000)
Dividends to stockholders	(20,905,000)	(17,933,000)	(7,631,000)
Payments on acquisition earn-outs	(983,000)	(6,453,000)	(42,842,000)
Deferred financing costs	(5,074,000)	(5,054,000)	(1,479,000)
Net cash provided by (used in) financing activities	261,460,000	(1,458,520,000)	(396,278,000)
Net increase (decrease) in cash and cash equivalents and restricted cash	(54,246,000)	46,452,000	8,101,000
Cash and cash equivalents and restricted cash at beginning of period	312,952,000	266,500,000	258,399,000
Cash and cash equivalents and restricted cash at end of period	258,706,000	312,952,000	266,500,000
Cash paid during the period for:
Interest	45,434,000	37,814,000	36,271,000
Taxes	57,181,000	99,551,000	99,381,000
Supplemental disclosure of non-cash operating, investing and financing activities:
Right-of-use assets and liabilities	$ 80,088,000	$ 138,799,000	$ 497,865,000