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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Mar. 31, 2023
USD ($)
property
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Significant Accounting Policies [Line Items]      
Restricted cash $ 22,385,000   $ 27,933,000
Acquisition of above-market in-place leases, amortization period 6 months    
Amortization expense for intangible assets $ 399,000 $ 29,082,000  
Write-off of fully amortized intangible assets 1,099,000 0  
Merger and integration cots 0 1,895,000  
Depreciation expense 52,887,000 49,092,000  
Fully depreciated fixed assets, wrote-off 2,920,000 1,160,000  
Casualty gains (losses), net (151,000) 1,393,000  
Interest costs capitalized $ 1,454,000 301,000  
Number of multifamily properties owned | property 119    
Investment in real estate under development $ 124,983,000   105,518,000
Right-of-use assets 2,914,000    
Lease liability 3,237,000    
Total operating lease expense 210,000 461,000  
Income tax expense 0 0  
Proceeds from retention credit refunds     6,238,000
Reimbursements costs     $ 3,006,000
Restructuring costs $ (3,213,000) 0  
Denver Colorado | Real Estate Investment      
Significant Accounting Policies [Line Items]      
Number of multifamily properties owned | property 2    
Views of Music City II / The Crockett | Nashville, TN      
Significant Accounting Policies [Line Items]      
IRT ownership interest 50.00%    
Lakeline Station | Austin, TX      
Significant Accounting Policies [Line Items]      
IRT ownership interest 90.00%    
Investments In Unconsolidated Real Estate Entities      
Significant Accounting Policies [Line Items]      
Interest costs capitalized $ 1,006,000 $ 210,000  
Property Operating Expenses      
Significant Accounting Policies [Line Items]      
Proceeds from retention credit refunds 788,000    
Property Management Expenses      
Significant Accounting Policies [Line Items]      
Proceeds from retention credit refunds 195,000    
General and Administrative Expense      
Significant Accounting Policies [Line Items]      
Proceeds from retention credit refunds $ 74,000    
Building and Building Improvements      
Significant Accounting Policies [Line Items]      
Depreciable Lives (In years) 40 years    
Minimum | Equipment and Fixtures      
Significant Accounting Policies [Line Items]      
Depreciable Lives (In years) 5 years    
Maximum      
Significant Accounting Policies [Line Items]      
Operating lease term 10 years    
Maximum | Equipment and Fixtures      
Significant Accounting Policies [Line Items]      
Depreciable Lives (In years) 10 years