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Real Estate Investments, Net - Additional Information (Detail)
3 Months Ended 11 Months Ended 12 Months Ended 23 Months Ended
Sep. 30, 2017
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Building
Acquisition
Dec. 31, 2016
USD ($)
Building
Acquisition
Dec. 31, 2017
USD ($)
Building
Acquisition
Real Estate Properties [Line Items]          
Ownership Percentage, Properties     100.00%    
Depreciation   $ 0 $ 8,137,000 $ 822,000  
Maximum percentage Of Fees And Expenses Associated With Acquisition 6.00%   6.00% 6.00% 6.00%
Number of Acquisitions Completed from Unaffiliated Parties | Acquisition     9   18
Capitalized Acquisition Costs and Fees Additions     $ 10,984,000    
Number of Buildings Acquired from Unaffiliated Parties | Building         40
Contract purchase price         $ 466,140,000
Related party transaction, expenses from transactions with related party     17,650,000 $ 9,112,000  
Medical Office Building [Member]          
Real Estate Properties [Line Items]          
Capital expenditures incurred     1,649,000 23,000  
Senior Housing [Member]          
Real Estate Properties [Line Items]          
Capital expenditures incurred     822,000 0  
Senior Housing-RIDEA [Member]          
Real Estate Properties [Line Items]          
Capital expenditures incurred     $ 5,000 $ 0  
2017 Acquisitions [Member]          
Real Estate Properties [Line Items]          
Ownership Percentage, Properties     100.00%    
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    
2016 Acquisitions [Member]          
Real Estate Properties [Line Items]          
Number of Acquisitions Completed from Unaffiliated Parties | Acquisition       9  
Number of Buildings Acquired from Unaffiliated Parties | Building       12  
2016 Acquisitions [Member]          
Real Estate Properties [Line Items]          
Ownership Percentage, Properties       100.00%  
Number of Acquisitions Completed from Unaffiliated Parties | Acquisition       9  
Number of Buildings Acquired from Unaffiliated Parties | Building       12  
Contract purchase price       $ 138,820,000  
Related Party Transactions Total Acquisition Fees       $ 6,247,000  
Contingent Advisor Payment Incurred [Member]          
Real Estate Properties [Line Items]          
Related party transaction, expenses from transactions with related party     5,095,000    
Contingent Advisor Payment Incurred [Member] | 2017 Acquisitions [Member]          
Real Estate Properties [Line Items]          
Related party transaction, expenses from transactions with related party     $ 7,342,000    
Advisor [Member]          
Real Estate Properties [Line Items]          
Base Acquisition Fee For Property Acquired         2.25%
Contingent Advisor Payment Fee         2.25%
Advisor [Member] | 2017 Acquisitions [Member]          
Real Estate Properties [Line Items]          
Base Acquisition Fee For Property Acquired     2.25%    
Contingent Advisor Payment Fee     2.25%    
Advisor [Member] | 2016 Acquisitions [Member]          
Real Estate Properties [Line Items]          
Base Acquisition Fee For Property Acquired       2.25%  
Contingent Advisor Payment Fee       2.25%