Fair Value of Financial Instruments - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Liabilities
Total Investment fair value changes, net	$ 22,523	$ 84,704	$ 45,722	$ 89,892
Total Residential Investor Loans
Liabilities
Total Investment fair value changes, net			348,000
Total ABS Issued
Liabilities
Beginning balance			17,433,600
Issuance			8,561,389
Sales			(3,689)
Principal paydowns			(3,191,968)
(Gains) losses in net income (loss), net			(283,425)
Other settlements, net			0
Ending balance	22,515,907		22,515,907
Change in unrealized (gains) or losses for the period included in earnings for liabilities held at the end of the reporting period			(373,025)
Non-controlling interest
Liabilities
Beginning balance			92,645
Issuance			0
Sales			0
Principal paydowns			0
(Gains) losses in net income (loss), net			3,605
Other settlements, net			(3,619)
Ending balance	92,631		92,631
Change in unrealized (gains) or losses for the period included in earnings for liabilities held at the end of the reporting period			289
Residential Consumer Loans
Assets
Beginning balance			17,935,761
Acquisitions			12,998,585
Originations			0
Sales			(4,592,312)
Transfer to fair value option			0
Principal paydowns			(2,557,332)
Consolidation of securitized bridge loans			0
Gains (losses) in net income, net			(140,968)
Unrealized gains in OCI, net			0
Other settlements, net			(5,038)
Ending balance	23,638,696		23,638,696
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period			(114,738)
Total Residential Investor Loans
Assets
Beginning balance			3,602,250
Acquisitions			0
Originations			842,158
Sales			(1,068,959)
Transfer to fair value option			0
Principal paydowns			(594,866)
Consolidation of securitized bridge loans			411,779
Gains (losses) in net income, net			(37,914)
Unrealized gains in OCI, net			0
Other settlements, net			(42,842)
Ending balance	3,111,606		3,111,606
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period			(39,501)
HEI
Assets
Beginning balance			329,883
Acquisitions			0
Originations			3,003
Sales			0
Transfer to fair value option			0
Principal paydowns			(9,542)
Consolidation of securitized bridge loans			0
Gains (losses) in net income, net			16,290
Unrealized gains in OCI, net			0
Other settlements, net			101
Ending balance	339,735		339,735
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period			16,499
Real Estate Trading Securities
Assets
Beginning balance			135,459
Acquisitions			98,314
Originations			0
Sales			(65,616)
Transfer to fair value option			0
Principal paydowns			(284)
Consolidation of securitized bridge loans			0
Gains (losses) in net income, net			25,677
Unrealized gains in OCI, net			0
Other settlements, net			0
Ending balance	193,550		193,550
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period			25,857
Real Estate AFS Securities
Assets
Beginning balance			287,557
Acquisitions			10,185
Originations			0
Sales			0
Transfer to fair value option			0
Principal paydowns			(549)
Consolidation of securitized bridge loans			0
Gains (losses) in net income, net			1,530
Unrealized gains in OCI, net			(11,376)
Other settlements, net			0
Ending balance	287,347		287,347
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period			(11,556)
Servicing Investments
Assets
Beginning balance			302,230
Acquisitions			4,572
Originations			0
Sales			0
Transfer to fair value option			0
Principal paydowns			(27,751)
Consolidation of securitized bridge loans			0
Gains (losses) in net income, net			11,774
Unrealized gains in OCI, net			0
Other settlements, net			0
Ending balance	290,825		290,825
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period			13,286
Strategic Investments
Assets
Beginning balance			6,310
Acquisitions			527
Originations			0
Sales			0
Transfer to fair value option			1,350
Principal paydowns			0
Consolidation of securitized bridge loans			0
Gains (losses) in net income, net			1,936
Unrealized gains in OCI, net			0
Other settlements, net			0
Ending balance	10,123		10,123
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period			(150)
Derivatives
Assets
Beginning balance			16,843
Acquisitions			0
Originations			0
Sales			0
Transfer to fair value option			0
Principal paydowns			0
Consolidation of securitized bridge loans			0
Gains (losses) in net income, net			44,039
Unrealized gains in OCI, net			0
Other settlements, net			(45,784)
Ending balance	$ 15,098		15,098
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period			$ 15,098