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Related Person Transactions - Amount Due from Related Parties (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Related Party Transaction [Line Items] |  |
Accounts Receivable | $ 38,597 | $ 29,965
Reimbursable Costs | 104,783 | 88,619
Total | 143,380 | 118,584
Perpetual Capital: |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 24,449 | 25,168
Reimbursable Costs | 50,650 | 81,559
Total | 75,099 | 106,727
Total Managed Equity REITs |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 21,898 | 23,505
Reimbursable Costs | 48,049 | 79,638
Total | 69,947 | 103,143
DHC |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 6,307 | 5,953
Reimbursable Costs | 11,358 | 13,434
Total | 17,665 | 19,387
ILPT |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 4,244 | 4,597
Reimbursable Costs | 7,968 | 5,869
Total | 12,212 | 10,466
OPI |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 5,877 | 7,427
Reimbursable Costs | 20,132 | 51,912
Total | 26,009 | 59,339
SVC |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 5,470 | 5,528
Reimbursable Costs | 8,591 | 8,423
Total | 14,061 | 13,951
SEVN |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 2,551 | 1,663
Reimbursable Costs | 2,601 | 1,921
Total | 5,152 | 3,584
Private Capital: |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 14,148 | 4,797
Reimbursable Costs | 54,133 | 7,060
Total | 68,281 | 11,857
AlerisLife |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 570 | 74
Reimbursable Costs | 0 | 0
Total | 570 | 74
Sonesta |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 82 | 89
Reimbursable Costs | 0 | 0
Total | 82 | 89
RMR Residential |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 9,587 | 0
Reimbursable Costs | 0 | 0
Total | 9,587 | 0
Other private entities |  |
Related Party Transaction [Line Items] |  |
Accounts Receivable | 3,909 | 4,634
Reimbursable Costs | 54,133 | 7,060
Total | $ 58,042 | $ 11,694

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