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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
investment
Mar. 31, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
property
Sep. 30, 2023
USD ($)
investment
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
property
Sep. 30, 2023
investment
Sep. 30, 2023
Significant Accounting Policies [Line Items]                    
Restricted cash       $ 27,933,000     $ 31,772,000      
Acquisition of above-market in-place leases, amortization period 6 months       6 months          
Amortization expense for intangible assets $ 133,000   $ 79,000   $ 532,000 $ 53,367,000        
Write-off of fully amortized intangible assets 0   0   1,099,000 58,048,000        
Amortization of intangible assets remainder             199,000      
Merger and integration cots 0   (275,000)   0 (3,477,000)        
Impairment charges 11,268,000   0   11,268,000 0        
Depreciation expense 55,083,000   49,268,000   161,670,000 146,222,000        
Fully depreciated fixed assets, wrote-off 7,563,000   0   15,596,000 3,092,000        
Casualty losses (gains), net 35,000   (191,000)   866,000 (7,176,000)        
Interest costs capitalized $ 1,926,000   618,000   $ 5,094,000 1,404,000        
Number of multifamily properties owned | property               120    
Investments in real estate under development       105,518,000     83,547,000      
Number of real estate investments ( in investments) | investment 2       2          
Number of investment in unconsolidated real estate entities               4 4  
Right-of-use assets       3,079,000     2,579,000      
Lease liability       3,401,000     2,882,000      
Total operating lease expense $ 219,000   252,000   $ 631,000 1,096,000        
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        
Property Operating Expenses                    
Significant Accounting Policies [Line Items]                    
Proceeds from retention credit refunds 593,000       2,170,000          
Property Management Expenses                    
Significant Accounting Policies [Line Items]                    
Proceeds from retention credit refunds 189,000       579,000          
General and Administrative Expense                    
Significant Accounting Policies [Line Items]                    
Proceeds from retention credit refunds 74,000       221,000          
Investments In Unconsolidated Real Estate Entities                    
Significant Accounting Policies [Line Items]                    
Interest costs capitalized $ 1,176,000   $ 484,000   $ 3,271,000 $ 969,000        
Real Estate Investment                    
Significant Accounting Policies [Line Items]                    
Investments in real estate under development       $ 0     $ 77,520,000      
Denver Colorado                    
Significant Accounting Policies [Line Items]                    
Number of multifamily properties owned | property               2    
Denver Colorado | Real Estate Investment                    
Significant Accounting Policies [Line Items]                    
Number of multifamily properties owned | property       2       2    
TENNESSEE | Views of Music City / The Crockett                    
Significant Accounting Policies [Line Items]                    
IRT Ownership Interest                   50.00%
TEXAS | Lakeline Station                    
Significant Accounting Policies [Line Items]                    
IRT Ownership Interest                   90.00%
Minimum                    
Significant Accounting Policies [Line Items]                    
Fair value assumption, cap rates                   6.00%
Maximum                    
Significant Accounting Policies [Line Items]                    
Fair value assumption, cap rates                   6.50%
Operating lease term 10 years       10 years          
Building and Building Improvements                    
Significant Accounting Policies [Line Items]                    
Depreciable Lives (In years) 40 years       40 years          
Equipment and Fixtures | Minimum                    
Significant Accounting Policies [Line Items]                    
Depreciable Lives (In years) 5 years       5 years          
Equipment and Fixtures | Maximum                    
Significant Accounting Policies [Line Items]                    
Depreciable Lives (In years) 10 years       10 years          
Leases Acquired In Place                    
Significant Accounting Policies [Line Items]                    
Acquisition of above-market in-place leases $ 398,000       $ 398,000