v3.25.1
Mortgage Notes Payable - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 21, 2025
Mar. 15, 2024
USD ($)
Item
Jul. 31, 2023
USD ($)
Item
Aug. 05, 2022
USD ($)
Property
Mar. 24, 2020
USD ($)
Item
Mar. 21, 2018
USD ($)
Item
Dec. 20, 2017
USD ($)
Item
Property
Mar. 13, 2015
USD ($)
Mar. 31, 2025
USD ($)
Property
Dec. 31, 2014
USD ($)
ft²
Dec. 31, 2024
USD ($)
Oct. 15, 2024
USD ($)
Debt Instrument [Line Items]                        
Mortgage notes payable                 $ 486,014,000   $ 486,822,000  
Number of wholly-owned subsidiaries of the UPREIT | Item   3 3   2 4 4          
Peoples United Bank [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable                       $ 14,400,000
Allstate Life Insurance Company, Loan [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable                 $ 33,723,000   33,945,000  
Maturity                 May 01, 2025      
Interest Rate                 4.00%      
3.82 % United States Life Insurance Company, Loan [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable             $ 39,000,000.0   $ 39,000,000   39,000,000  
Permanent financing period             10 years          
Debt instrument, payment terms                 During the period from February 1, 2018 to December 1, 2027, payments of interest only on the principal balance of the U.S. Life Note (as defined below) will be payable in arrears, with the entire principal balance due and payable on January 1, 2028, the loan maturity date.      
Number of collateralized properties | Property             4          
Maturity             Jan. 01, 2028   Jan. 01, 2028      
Interest Rate             3.82%   3.82%      
Application fee to lender             $ 50,000          
Event of default, description                 In the event of default, the initial rate of interest on the U.S. Life Note will increase to the greatest of (i) 18% per annum, (ii) a per annum rate equal to 4% over the prime established rate, or (iii) a per annum rate equal to 5% over the original interest rate, all subject to the applicable state or federal laws.      
3.82 % United States Life Insurance Company, Loan [Member] | Minimum [Member]                        
Debt Instrument [Line Items]                        
Loan Prepayment Premium Percentage,upon providing advance notice of prepayment             1.00%          
3.82 % United States Life Insurance Company, Loan [Member] | Minimum [Member] | Event of Default [Member]                        
Debt Instrument [Line Items]                        
Increase in debt instrument interest rate upon default             18.00%          
3.82 % United States Life Insurance Company, Loan [Member] | Prime Rate [Member] | Event of Default [Member]                        
Debt Instrument [Line Items]                        
Debt instrument Interest rate upon default             4.00%          
3.82 % United States Life Insurance Company, Loan [Member] | Original Interest Rate [Member] | Event of Default [Member]                        
Debt Instrument [Line Items]                        
Debt instrument interest rate over original interest rate upon default             5.00%          
4.25 % United States Life Insurance Company, Loan [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable           $ 33,000,000.0     $ 31,913,000   32,059,000  
Permanent financing interest rate           4.25%            
Permanent financing period           10 years            
Debt instrument, payment terms                 the principal balance for the first five years of the term and principal and interest payments (amortized over a 30-year period) during the second five years of the term. The entire principal balance is due and payable on April 1, 2028, the loan maturity date.      
Maturity                 Apr. 01, 2028      
Interest Rate                 4.25%      
3.45% Transamerica Life Insurance Company, Loan [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable         $ 8,400,000       $ 7,750,000   7,809,000  
Permanent financing interest rate         3.45%              
Permanent financing period         10 years              
Debt instrument, payment terms                 principal balance of the note until April 1, 2022 and (ii) principal and interest payments (amortized over a 25-year period commencing at the end of the interest-only period) from May 1, 2022 through March 1, 2030. The entire principal balance of each note is due and payable on April 1, 2030, the loan maturity date      
Maturity                 Apr. 01, 2030      
Interest Rate                 3.45%      
3.45% Transamerica Life Insurance Company, Loan [Member] | Event of Default [Member]                        
Debt Instrument [Line Items]                        
Event of default, description                 If a default exists, the outstanding principal balance of the notes shall, at the option of the lender, bear interest at a rate equal to the lesser of (i) 10% per annum over the note rate and (ii) the highest rate of interest permitted to be paid or collected by applicable law with respect to the loan.      
3.45% Transamerica Life Insurance Company, Loan [Member] | Minimum [Member]                        
Debt Instrument [Line Items]                        
Loan Prepayment Premium Percentage,upon providing advance notice of prepayment         1.00%              
3.45% Transamerica Life Insurance Company, Loan [Member] | Note Rate [Member] | Event of Default [Member]                        
Debt Instrument [Line Items]                        
Debt instrument Interest rate upon default         10.00%              
Transamerica Life Insurance Company 2023, Loan [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable     $ 25,000,000           $ 25,000,000   25,000,000  
Permanent financing interest rate     5.40%                  
Permanent financing period     10 years                  
Debt instrument, payment terms                 principal balance of the note until August 1, 2026 and (ii) principal and interest payments (amortized over a 30-year period commencing at the end of the interest-only period) from September 1, 2026 through July 1, 2033. The entire principal balance of each note is due and payable on August 1, 2033, the loan maturity date      
Maturity                 Aug. 01, 2033      
Interest Rate                 5.40%      
Transamerica Life Insurance Company 2023, Loan [Member] | Event of Default [Member]                        
Debt Instrument [Line Items]                        
Event of default, description                 If a default exists, the outstanding principal balance of the notes shall, at the option of the lender, bear interest at a rate equal to the lesser of (i) 10% per annum over the note rate and (ii) the highest rate of interest permitted to be paid or collected by applicable law with respect to the loan      
Transamerica Life Insurance Company 2023, Loan [Member] | Minimum [Member]                        
Debt Instrument [Line Items]                        
Loan Prepayment Premium Percentage,upon providing advance notice of prepayment     1.00%                  
Transamerica Life Insurance Company 2023, Loan [Member] | Note Rate [Member] | Event of Default [Member]                        
Debt Instrument [Line Items]                        
Debt instrument Interest rate upon default     10.00%                  
American International Group 2022, Loan [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable                 $ 225,000,000   $ 225,000,000  
Maturity                 Sep. 01, 2032      
Interest Rate                 4.63%      
American International Group 2022, Loan [Member] | A I G Loans                        
Debt Instrument [Line Items]                        
Maturity       Sep. 01, 2032                
Interest Rate       4.63%                
Loan related costs       $ 7,900,000                
Prepayment fee       5,100,000                
Debt instrument, principal amount       $ 225,000,000.0                
Debt instrument, interest rate terms                 monthly interest-only payments      
Number of properties secured | Property       25                
American General Life Insurance Company [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable   $ 125,000,000                    
Permanent financing period   7 years                    
Payment term based on amortization schedule   30 years                    
Debt instrument, payment terms                 The loan is a seven-year term loan that requires payments based on a 30-year amortization schedule at the rate of 6.12% per annum with the entire principal balance plus any accrued and unpaid interest due and payable on April 1, 2031.      
Interest Rate   6.12%                    
Debt instrument, principal amount   $ 90,000,000                    
American General Life Insurance Company [Member] | Minimum [Member]                        
Debt Instrument [Line Items]                        
Loan Prepayment Premium Percentage,upon providing advance notice of prepayment   1.00%                    
Revolving Line of Credit Facility [Member] | American General Life Insurance Company [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount   $ 40,000,000                    
Term Loan [Member] | American General Life Insurance Company [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount   $ 50,000,000                    
Piscataway, NJ [Member]                        
Debt Instrument [Line Items]                        
Number of properties acquired | Property                 6      
Piscataway, NJ [Member] | Allstate Life Insurance Company, Loan [Member]                        
Debt Instrument [Line Items]                        
Mortgage notes payable                 $ 39,100,000      
Permanent financing period               10 years        
Payment term based on amortization schedule               30 years        
Debt Instrument, balloon payment due upon maturity               $ 33,700,000        
Maturity May 01, 2025             Apr. 01, 2025        
Interest Rate 6.25%             4.00%        
New York [Member] | American International Group 2022, Loan [Member] | A I G Loans                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 144,300,000                
Connecticut And New Jersey | American International Group 2022, Loan [Member] | A I G Loans                        
Debt Instrument [Line Items]                        
Debt instrument, principal amount       $ 80,700,000                
People's United Bank Loan Agreement [Member]                        
Debt Instrument [Line Items]                        
Leasable area owned by the company | ft²                   84,000    
Mortgage notes payable                   $ 15,500,000    
Permanent financing interest rate                   4.18%    
Permanent financing period                   10 years    
Payment term based on amortization schedule                   25 years    
Debt instrument, payment terms                 Payments for the first seven years were interest only. Payments over the remaining three years of the term were based on a 25-year amortization schedule, with a balloon payment of $14.4 million due at maturity      
Debt Instrument, balloon payment due upon maturity                   $ 14,400,000