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Mortgage Loans Payable, Net - Additional Information (Detail)
Sep. 30, 2017
USD ($)
MortgageLoan
Dec. 31, 2016
USD ($)
MortgageLoan
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mortgage Loans on Real Estate [Line Items]        
Mortgage loans payable, gross $ 11,718,000 $ 3,908,000    
Mortgage loans payable, net $ 11,639,000 [1] $ 3,965,000 [1] $ 3,847,000 $ 0
Number Of Fixed Rate Mortgage Loans Payable | MortgageLoan 2 1    
Minimum [Member]        
Mortgage Loans on Real Estate [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage 4.77% 5.25%    
Maximum [Member]        
Mortgage Loans on Real Estate [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage 5.25%      
Mortgage Loans Payable, Net [Member]        
Mortgage Loans on Real Estate [Line Items]        
Debt, Weighted Average Interest Rate 4.92%      
[1] Such liabilities of Griffin-American Healthcare REIT IV, Inc. as of September 30, 2017 and December 31, 2016 represented liabilities of Griffin-American Healthcare REIT IV Holdings, LP, a variable interest entity and consolidated subsidiary of Griffin-American Healthcare REIT IV, Inc. The creditors of Griffin-American Healthcare REIT IV Holdings, LP do not have recourse against Griffin-American Healthcare REIT IV, Inc., except for the Line of Credit, as defined in Note 7, held by Griffin-American Healthcare REIT IV Holdings, LP in the amount of $26,000,000 and $33,900,000 as of September 30, 2017 and December 31, 2016, respectively, which is guaranteed by Griffin-American Healthcare REIT IV, Inc.