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Mortgage Loans Payable, Net - Additional Information (Detail)
Dec. 31, 2018
USD ($)
MortgageLoan
Dec. 31, 2017
USD ($)
MortgageLoan
Dec. 31, 2016
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Mortgage loans payable, gross $ 17,256,000 $ 11,634,000  
Mortgage loans payable, net(1) $ 16,892,000 [1] $ 11,567,000 [1] $ 3,965,000
Weighted average effective interest rate 4.25% 3.45%  
Number Of Fixed Rate Mortgage Loans Payable | MortgageLoan 3 2  
Minimum [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage 3.75% 4.77%  
Maximum [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage 5.25% 5.25%  
Mortgage Loans Payable, Net [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Weighted average effective interest rate 4.51% 4.92%  
[1] Such liabilities of Griffin-American Healthcare REIT IV, Inc. as of December 31, 2018 and 2017 represented liabilities of Griffin-American Healthcare REIT IV Holdings, LP or its consolidated subsidiaries. Griffin-American Healthcare REIT IV Holdings, LP is a variable interest entity and a consolidated subsidiary of Griffin-American Healthcare REIT IV, Inc. The creditors of Griffin-American Healthcare REIT IV Holdings, LP or its consolidated subsidiaries do not have recourse against Griffin-American Healthcare REIT IV, Inc., except for the 2018 Credit Facility and 2017 Credit Facility, as defined in Note 7, held by Griffin-American Healthcare REIT IV Holdings, LP in the amount of $275,000,000 and $84,100,000 as of December 31, 2018 and 2017, respectively, which is guaranteed by Griffin-American Healthcare REIT IV, Inc.