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Summary of Significant Accounting Policies - Merger (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 27 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2024 USD ($)
Purchase consideration |  |  |  |  |  |  |
Cash consideration paid by the Company to iStar |  |  |  |  | $ 88,685 |  |
Impairment of goodwill |  |  | $ 145,365 |  | 145,365 |  |
Purchase price allocation |  |  |  |  |  |  |
Deferred tax asset, net | [1] |  |  |  |  | $ 7,619 | $ 6,706
Operating lease, right-of-use asset |  |  |  |  |  | $ 33,964 | $ 30,801
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  | Deferred Costs and Other Assets | Deferred Costs and Other Assets
Office furniture and equipment |  |  |  |  |  | $ 979 | $ 718
Operating lease liabilities |  |  |  |  |  | $ 15,751 | $ 11,749
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  | Accounts payable, accrued expenses and other liabilities | Accounts payable, accrued expenses and other liabilities
Goodwill |  |  |  |  |  |  |
Carrying value of reporting unit used in goodwill evaluation |  |  | 2,400,000 |  | 2,400,000 |  |
Impairment of goodwill |  |  | 145,365 |  | 145,365 |  |
Secured Term Loan Facility |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |
Provision (recovery) for credit losses |  |  |  |  | 2,300 |  |
iStar Merger |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |
Total Company shares as purchase price | shares |  | 1,195,034 |  |  |  |  |
Stock price of the Company's common stock | $ / shares |  | $ 29.78 |  |  |  |  |
Fair value of the Company's stock transferred |  | $ 35,588 |  |  |  |  |
Cash consideration paid by the Company to iStar |  | 88,685 |  |  |  |  |
Purchase consideration |  | $ 124,273 |  |  |  |  |
Shares issued as settled for iStar preexisting investment in the Company which are excluded from purchase consideration | shares |  | 12,700,000 |  |  |  |  |
Merger expenses |  |  |  |  | 18,900 |  | $ 26,600
Merger related nonrecurring charges |  |  |  |  | 3,000 |  |
Impairment of goodwill |  |  |  |  |  | $ 145,365 |
Purchase price allocation |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 3,213 |  |  |  |  |
Real estate |  | 1,508 |  |  |  |  |
Equity investments |  | 61,247 |  |  |  |  |
Deferred tax asset, net |  | 6,292 |  | $ 6,300 |  |  |
Deferred expenses and other assets |  | 31,922 |  |  |  |  |
Total assets acquired |  | 104,182 |  |  |  |  |
Accounts payable, accrued expenses and other liabilities |  | (25,279) |  |  |  |  |
Debt obligations, net |  | (99,995) |  |  |  |  |
Total liabilities assumed |  | (125,274) |  |  |  |  |
Net identifiable (liabilities assumed) assets acquired |  | (21,092) |  |  |  |  |
Goodwill |  | 145,365 |  |  |  |  |
Operating lease, right-of-use asset |  | $ 11,000 |  |  |  |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  | Deferred Costs and Other Assets |  |  |  |  |
Prepaid expenses |  | $ 4,700 |  |  |  |  |
Operating lease liabilities |  | $ 14,200 |  |  |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  | Accounts payable, accrued expenses and other liabilities |  |  |  |  |
Obligations assumed which are directly offset by corresponding equivalent cash and receivable assets acquired sufficient to settle such obligations. |  | $ 8,700 |  |  |  |  |
Deferred tax assets valuation allowance |  |  |  | 2,800 |  |  |
Reduction in goodwill |  |  |  | $ 6,300 |  |  |
Goodwill |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  | $ 145,365 |
iStar Merger | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input [Extensible Enumeration] |  | Measurement Input, Discount Rate |  |  |  |  |
Debt Instrument, Measurement Input |  | 6.7 |  |  |  |  |
Debt Instrument, Measurement Input [Extensible Enumeration] |  | Measurement Input, Discount Rate |  |  |  |  |
iStar Merger | Fair Value, Inputs, Level 3 | Measurement Input, Discount Rate | Minimum |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input |  | 0.072 |  |  |  |  |
iStar Merger | Fair Value, Inputs, Level 3 | Measurement Input, Discount Rate | Maximum |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |
Equity Securities, FV-NI, Measurement Input |  | 0.139 |  |  |  |  |
iStar Merger | Deferred expenses and other assets |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |
In-place prepaid contracts |  | $ 2,100 |  |  |  |  |
Office furniture and equipment |  | 1,300 |  |  |  |  |
Other receivables |  | 6,300 |  |  |  |  |
iStar Merger | Other expense |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |
Merger expenses |  |  | 100 |  | 14,100 |  |
Merger related nonrecurring charges |  |  |  |  | 900 |  |
iStar Merger | General and Administrative Expense |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |
Merger expenses |  |  |  |  | 4,800 |  |
iStar Merger | Preliminary Purchase Price Allocation |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |
Purchase consideration |  | 124,273 |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |
Cash and cash equivalents |  | 3,213 |  |  |  |  |
Real estate |  | 1,508 |  |  |  |  |
Equity investments |  | 61,247 |  |  |  |  |
Deferred expenses and other assets |  | 25,442 |  |  |  |  |
Total assets acquired |  | 91,410 |  |  |  |  |
Accounts payable, accrued expenses and other liabilities |  | (22,939) |  |  |  |  |
Debt obligations, net |  | (99,995) |  |  |  |  |
Total liabilities assumed |  | (122,934) |  |  |  |  |
Net identifiable (liabilities assumed) assets acquired |  | (31,524) |  |  |  |  |
Goodwill |  | 155,797 |  |  |  |  |
iStar Merger | Measurement Period Adjustment |  |  |  |  |  |  |
Purchase price allocation |  |  |  |  |  |  |
Deferred tax asset, net |  | 6,292 |  |  |  |  |
Deferred expenses and other assets |  | 6,480 | 6,500 |  | 6,500 |  |
Total assets acquired |  | 12,772 |  |  |  |  |
Accounts payable, accrued expenses and other liabilities |  | (2,340) | $ (2,300) |  | $ (2,300) |  |
Total liabilities assumed |  | (2,340) |  |  |  |  |
Net identifiable (liabilities assumed) assets acquired |  | 10,432 |  |  |  |  |
Goodwill |  | $ (10,432) |  |  |  |  |
[1] | Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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