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Notes Payable - Additional Information (Detail)
3 Months Ended
Mar. 05, 2020
USD ($)
property
loan
Feb. 13, 2020
USD ($)
extension
Mar. 31, 2020
USD ($)
property
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Noncash or Part Noncash Acquisition, Debt Assumed     $ 45,833,000 $ 0  
Long-term Debt, Fair Value     45,833,000    
Debt Instrument, Unamortized Discount (Premium), Net $ 1,100,000        
Principal amount     $ 905,645,000   $ 860,958,000
$60M Term Loan          
Debt Instrument [Line Items]          
Extension period     24 months    
Debt service coverage ratio     110.00%    
Unsecured Revolving Credit Facility, $500 Million [Member] | Minimum          
Debt Instrument [Line Items]          
Commitment fee percentage if pricing structure is converted to be based on an investment-grade rating   0.125%      
Unsecured Revolving Credit Facility, $500 Million [Member] | Maximum          
Debt Instrument [Line Items]          
Commitment fee percentage if pricing structure is converted to be based on an investment-grade rating   0.30%      
Unsecured Revolving Credit Facility, $500 Million [Member] | Eurodollar          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.00%      
Unsecured Revolving Credit Facility, $500 Million [Member] | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.05%      
Basis spread on variable rate if additional investment grade rating attained   0.00%      
Unsecured Revolving Credit Facility, $500 Million [Member] | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.50%      
Basis spread on variable rate if additional investment grade rating attained   0.45%      
Unsecured Revolving Credit Facility, $500 Million [Member] | Thirty-day LIBOR plus | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.05%      
Basis spread on variable rate if additional investment grade rating attained   0.725%      
Unsecured Revolving Credit Facility, $500 Million [Member] | Thirty-day LIBOR plus | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.50%      
Basis spread on variable rate if additional investment grade rating attained   1.40%      
Unsecured Revolving Credit Facility, $500 Million [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.50%      
Amended Term Loan Facility, $100 Million [Member] | Base Rate | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.20%      
Basis spread on variable rate if additional investment grade rating attained   0.00%      
Amended Term Loan Facility, $100 Million [Member] | Base Rate | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate   0.70%      
Basis spread on variable rate if additional investment grade rating attained   0.65%      
Amended Term Loan Facility, $100 Million [Member] | Thirty-day LIBOR plus | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.20%      
Basis spread on variable rate if additional investment grade rating attained   0.85%      
Amended Term Loan Facility, $100 Million [Member] | Thirty-day LIBOR plus | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate   1.70%      
Basis spread on variable rate if additional investment grade rating attained   1.65%      
Revolving Credit Facility          
Debt Instrument [Line Items]          
Extension period     6 months    
Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Commitment fee percentage   0.15%      
Revolving Credit Facility | Maximum          
Debt Instrument [Line Items]          
Commitment fee percentage   0.30%      
Revolving Credit Facility | Thirty-day LIBOR plus          
Debt Instrument [Line Items]          
Basis spread on variable rate     1.05%    
Revolving Credit Facility | Thirty-day LIBOR plus | Minimum          
Debt Instrument [Line Items]          
Basis spread on variable rate     1.05%    
Revolving Credit Facility | Thirty-day LIBOR plus | Maximum          
Debt Instrument [Line Items]          
Basis spread on variable rate     1.50%    
Term Loan | $60M Term Loan          
Debt Instrument [Line Items]          
Number Of Properties Securing Loan | property     6    
Principal amount     $ 58,499,000   $ 58,499,000
Term Loan | $60M Term Loan | Thirty-day LIBOR plus          
Debt Instrument [Line Items]          
Basis spread on variable rate     1.70%    
Line of Credit | Revolving Credit Facility | Unsecured Revolving Credit Facility, $500 Million [Member]          
Debt Instrument [Line Items]          
Credit facility maximum future borrowing capacity   $ 500,000,000.0      
Line Of Credit Facility, Number Of Extensions | extension   2      
Line of Credit | Unsecured Credit Facility | Senior Unsecured Credit Facility, 600 Million [Member]          
Debt Instrument [Line Items]          
Credit facility maximum future borrowing capacity   $ 600,000,000.0      
Debt instrument - contingent additional borrowings   900,000,000.0      
Line of Credit | Term Loan | Amended Term Loan Facility, $100 Million [Member]          
Debt Instrument [Line Items]          
Credit facility maximum future borrowing capacity   $ 100,000,000.0      
Unsecured Credit Facility | Revolving Credit Facility          
Debt Instrument [Line Items]          
Additional availability     $ 500,000,000.0    
$100M Notes          
Debt Instrument [Line Items]          
Principal amount     100,000,000    
$125M senior notes          
Debt Instrument [Line Items]          
Principal amount     $ 125,000,000    
The Credit Facility, $225 Million Term Loan Facility, $150 Million Term Loan Facility, $100 Million Notes, $125 Million Notes, Series 2019A and Series 2019B Notes          
Debt Instrument [Line Items]          
Maximum ratio of total indebtedness to total asset value     60.00%    
Maximum ratio of recourse debt to total asset     15.00%    
Minimum tangible net worth required     $ 760,740,750    
Minimum percentage of equity proceeds to be used in minimum tangible net worth calculation     75.00%    
Minimum ratio of EBITDA to fixed charges     1.5    
Maximum ratio of unsecured debt to the value of the unencumbered asset pool     60.00%    
Minimum ratio of NOI unsecured interest expense     1.75    
Funds from operations percentage     95.00%    
Credit Facility And Term Loan Facility, 225 and 150 Million          
Debt Instrument [Line Items]          
Maximum ratio of secured debt to total asset value     45.00%    
Minimum tangible net worth required     $ 2,061,865,500    
Minimum percentage of equity proceeds to be used in minimum tangible net worth calculation     75.00%    
Senior Notes, 100 Million, 125 Million, Series 2019A and Series 2019B          
Debt Instrument [Line Items]          
Maximum ratio of secured debt to total asset value     40.00%    
Secured Debt [Member]          
Debt Instrument [Line Items]          
Noncash or Part Noncash Acquisition, Debt Assumed     $ 44,700,000    
Secured Debt [Member] | Minimum          
Debt Instrument [Line Items]          
Fixed interest rate 3.70%        
Secured Debt [Member] | Maximum          
Debt Instrument [Line Items]          
Fixed interest rate 5.24%        
Properties Acquired on March 5, 2020 [Member]          
Debt Instrument [Line Items]          
Number Of Mortgage Loans Assumed | loan 9        
Number Of Properties Securing Loan | property 9        
Long-term Debt, Fair Value $ 45,800,000        
Properties Acquired on March 5, 2020 [Member] | Minimum          
Debt Instrument [Line Items]          
Debt Instrument, Maturity Date Range, End     3 years    
Properties Acquired on March 5, 2020 [Member] | Maximum          
Debt Instrument [Line Items]          
Debt Instrument, Maturity Date Range, End     8 years 3 months 18 days