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Business Combinations - Additional Information (Detail)
12 Months Ended 47 Months Ended
Dec. 31, 2018
USD ($)
Acquisition
Dec. 31, 2017
USD ($)
Acquisition
Building
Dec. 31, 2016
USD ($)
Acquisition
Building
Dec. 31, 2018
USD ($)
Acquisition
Building
Jan. 01, 2015
$ / shares
Business Acquisitions [Line Items]          
Number of Acquisitions Completed from Unaffiliated Parties | Acquisition   9   33  
Minimum Percent Share Of Each State Annualized Base Rent That Company Owned 10.00%     10.00%  
Number of Buildings Acquired from Unaffiliated Parties | Building       69  
Contract purchase price       $ 821,689,000  
Acquisition related expenses $ 2,795,000 $ 655,000 $ 4,745,000    
2017 Acquisitions [Member]          
Business Acquisitions [Line Items]          
Total assets acquired   $ 0      
Number of Acquisitions Completed from Unaffiliated Parties | Acquisition   9      
Number of Buildings Acquired from Unaffiliated Parties | Building   28      
Contract purchase price   $ 327,320,000      
Related Party Transactions Total Acquisition Fees   $ 14,684,000      
2018 Acquisitions [Member]          
Business Acquisitions [Line Items]          
Total assets acquired $ 0     $ 0  
Number of Acquisitions Completed from Unaffiliated Parties | Acquisition 15        
2016 Acquisitions [Member]          
Business Acquisitions [Line Items]          
Number of Acquisitions Completed from Unaffiliated Parties | Acquisition     9    
Share price | $ / shares         $ 10.00
Number of Buildings Acquired from Unaffiliated Parties | Building     12    
Contingent Advisor Payment Incurred [Member]          
Business Acquisitions [Line Items]          
Due to Affiliate     $ 3,123,000    
2016 Acquisitions [Member]          
Business Acquisitions [Line Items]          
Contract purchase price     138,820,000    
Related Party Transactions Total Acquisition Fees     $ 4,522,000