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Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2025 | Sep. 15, 2025 | Jan. 31, 2025 | Jun. 30, 2023 | Nov. 30, 2019 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2020 | Dec. 31, 2022
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average ownership interest |  |  |  |  |  |  |  | 4.90% | 5.20% |  |  |
Equity method investment aggregate cost |  |  |  |  | $ 275,000,000 |  |  |  |  |  |  |
Equity method investment term |  |  |  |  | 5 years |  |  |  |  |  |  |
Equity method investment interest rate |  |  |  |  | 10.00% |  |  |  |  |  |  |
Percentage of noncontrolling position sold |  |  |  | 20.00% |  |  |  |  |  |  |  |
Proceeds from sale of noncontrolling position |  |  |  | $ 33,500,000 |  |  |  |  |  |  |  |
Consolidated income (loss) subject to tax |  |  |  |  |  | $ (2,700,000) | $ (9,700,000) | $ (5,900,000) | $ (21,600,000) |  |  |
Income tax benefit (expense) |  |  |  |  |  | 116,000 | 3,814,000 | (5,370,000) | 8,731,000 |  |  |
Income tax expense attributable to discontinued operations |  |  |  |  |  | 177,000 |  | 177,000 |  |  |  |
Impairment |  |  |  |  |  | 57,400,000 | 0 | 57,400,000 | 0 |  |  |
Revenues |  |  |  |  |  | 2,000,000 | 1,900,000 | 5,500,000 | 4,900,000 |  |  |
Preferred equity interest receives preferred return | 8.00% |  |  |  |  |  |  |  |  |  |  |
Preferred equity interest in one joint ventures accruing preferred return | 9.70% |  |  |  |  |  |  |  |  |  |  |
Preferred equity interest accruing preferred return | 14.50% |  |  |  |  |  |  |  |  |  |  |
Realized and unrealized gains (losses) on equity investments |  |  |  |  |  | (4,868,000) | (566,000) | (5,475,000) | (48,101,000) |  |  |
Property Technology Funds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on investment |  |  |  |  |  |  |  | 1,000,000 | 200,000 |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) on investment |  |  |  |  |  | 900,000 | (600,000) |  | (1,300,000) |  |  |
Net gains (losses) on investment |  |  |  |  |  | 400,000 |  | (300,000) |  |  |  |
Financing Note [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 43,200,000 |  |  |  |  | $ 43,200,000 |  | $ 43,200,000 |  |  |  |
Effective interest rate | 6.00% |  |  |  |  | 6.00% |  | 6.00% |  |  |  |
Unamortized discount | $ 1,800,000 |  |  |  |  | $ 1,800,000 |  | $ 1,800,000 |  | $ 2,700,000 |  |
Amortization of discount |  |  |  |  |  | 300,000 | 900,000 | 300,000 | 900,000 |  |  |
IQHQ [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment aggregate cost | 39,185,000 |  |  |  |  | 39,185,000 |  | 39,185,000 |  | 39,185,000 |  | $ 39,200,000
Commitment purchase amount |  |  |  |  |  |  |  |  |  |  | $ 50,000 |
Percentage of ownership of units |  |  |  |  |  |  |  |  |  |  |  | 22.00%
Equity method investment redemption with step-up value to be paid in cash |  |  |  |  |  |  |  |  |  |  |  | $ 16,500,000
Equity method investments fair value |  |  |  |  |  |  |  |  |  |  |  | $ 59,700,000
Non-cash impairment charge |  |  |  |  |  | 6,200,000 |  |  |  | 48,600,000 |  |
Mezzanine investment | 4,849,000 |  |  |  |  | 4,849,000 |  | 4,849,000 |  | $ 11,071,000 |  |
Aimco OP L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payment made to mezzaine investment |  |  |  | $ 134,000,000 |  |  |  |  |  |  |  |
Income tax benefit (expense) |  |  |  |  |  | 116,000 | 3,814,000 | (5,370,000) | 8,731,000 |  |  |
Income tax expense attributable to discontinued operations |  |  |  |  |  |  |  | 177,000 |  |  |  |
Realized and unrealized gains (losses) on equity investments |  |  |  |  |  | (4,868,000) | $ (566,000) | (5,475,000) | $ (48,101,000) |  |  |
S 2025 Q1 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid per share |  |  | $ 0.6 |  |  |  |  |  |  |  |  |
Dividends payable, date declared |  |  |  |  |  |  |  |  |  | Dec. 19, 2024 |  |
Dividends payable, date of record |  |  |  |  |  |  |  |  |  | Jan. 14, 2025 |  |
Dividends payable, month and year to be paid |  |  |  |  |  |  |  |  |  | 2025-01 |  |
Forfeitable dividends on certain unvested share-based compensation awards to be paid upon achievement |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |
S 2025 Q2 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date to be paid |  |  |  |  |  |  |  |  |  | Oct. 15, 2025 |  |
S 2025 Q3 Dividends [Member] |  |  |  |  |  |  |  |  |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid per share |  | $ 2.23 |  |  |  |  |  |  |  |  |  |
Dividends payable, date declared |  |  |  |  |  |  |  |  |  | Sep. 15, 2025 |  |
Forfeitable dividends on certain unvested share-based compensation awards to be paid upon achievement | $ 332,500,000 |  |  |  |  | $ 332,500,000 |  | $ 332,500,000 |  |  |  |

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