XML 12 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 09, 2019
Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Registrant Name Griffin-American Healthcare REIT IV, Inc.  
Entity Central Index Key 0001632970  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company true  
Entity Small Business false  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Current Reporting Status Yes  
Common Class T [Member]    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   73,914,043
Common Class I [Member]    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   5,644,277