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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
property
jointVenture
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
jointVenture
Jun. 30, 2023
USD ($)
property
jointVenture
Dec. 31, 2022
USD ($)
property
Jun. 30, 2022
USD ($)
jointVenture
Significant Accounting Policies [Line Items]            
Restricted cash $ 28,163,000     $ 28,163,000 $ 27,933,000  
Acquisition of above-market in-place leases, amortization period 6 months     6 months    
Number of joint ventures | jointVenture 5   1 5   1
Amortization expense for intangible assets $ 0   $ 24,206,000 $ 399,000   $ 53,288,000
Write-off of fully amortized intangible assets 0   58,048,000 1,099,000   58,048,000
Merger and integration cots 0   (1,307,000) 0   (3,202,000)
Depreciation expense 53,700,000   48,092,000 106,587,000   96,954,000
Fully depreciated fixed assets, wrote-off 5,114,000   1,932,000 8,033,000   3,092,000
Casualty gains (losses), net (680,000)   5,592,000 (831,000)   6,985,000
Interest costs capitalized $ 1,715,000   486,000 $ 3,168,000   786,000
Number of multifamily properties owned | property 119     119    
Investments in real estate under development $ 121,733,000     $ 121,733,000 105,518,000  
Right-of-use assets 2,748,000     2,748,000 3,079,000  
Lease liability 3,061,000     3,061,000 3,401,000  
Total operating lease expense 202,000   383,000 412,000   844,000
Income tax expense 0   0 0   0
Proceeds from retention credit refunds         6,238,000  
Reimbursements costs         3,006,000  
Restructuring costs 0 $ 3,213,000 0 3,213,000   0
Leases Acquired In Place            
Significant Accounting Policies [Line Items]            
Acquisition of above-market in-place leases     37,000     37,000
Real Estate Investment            
Significant Accounting Policies [Line Items]            
Investments in real estate under development $ 19,372,000     $ 19,372,000 $ 0  
Denver Colorado            
Significant Accounting Policies [Line Items]            
Number of multifamily properties owned | property 2     2    
Denver Colorado | Real Estate Investment            
Significant Accounting Policies [Line Items]            
Number of multifamily properties owned | property 2     2 2  
Views of Music City / The Crockett | Nashville, TN            
Significant Accounting Policies [Line Items]            
IRT ownership interest 50.00%     50.00%    
Lakeline Station | Austin, TX            
Significant Accounting Policies [Line Items]            
IRT ownership interest 90.00%     90.00%    
Investments In Unconsolidated Real Estate Entities            
Significant Accounting Policies [Line Items]            
Interest costs capitalized $ 1,089,000   $ 276,000 $ 2,095,000   $ 486,000
Property Operating Expenses            
Significant Accounting Policies [Line Items]            
Proceeds from retention credit refunds 788,000     1,576,000    
Property Management Expenses            
Significant Accounting Policies [Line Items]            
Proceeds from retention credit refunds 195,000     390,000    
General and Administrative Expense            
Significant Accounting Policies [Line Items]            
Proceeds from retention credit refunds $ 74,000     $ 147,000    
Building and Building Improvements            
Significant Accounting Policies [Line Items]            
Depreciable Lives (In years) 40 years     40 years    
Minimum | Equipment and Fixtures            
Significant Accounting Policies [Line Items]            
Depreciable Lives (In years) 5 years     5 years    
Maximum            
Significant Accounting Policies [Line Items]            
Operating lease term 10 years     10 years    
Maximum | Equipment and Fixtures            
Significant Accounting Policies [Line Items]            
Depreciable Lives (In years) 10 years     10 years