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Line of Credit and Term Loan (Detail)
1 Months Ended
Oct. 31, 2017
USD ($)
Extension_period
Aug. 25, 2016
USD ($)
Extension
Nov. 03, 2017
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity $ 200,000,000     $ 200,000,000 $ 100,000,000
Line of Credit Facility, Collateral   750000000      
Line Of Credit Facility, Number Of Potential Extensions 1 1      
Line Of Credit Facility, Potential Extension Term 12 months 12 months      
Line of credit and term loan [1]       $ 62,300,000 $ 84,100,000
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Debt, Weighted Average Interest Rate       3.55% 3.45%
Term Loan [Member]          
Line of Credit Facility [Line Items]          
Line Of Credit Facility, Potential Increase Amount To Borrowing Capacity $ 50,000,000        
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity 150,000,000 $ 100,000,000      
Revolving Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Line Of Credit Facility, Potential Increase Amount To Borrowing Capacity 50,000,000        
Aggregate Revolving Commitments [Member]          
Line of Credit Facility [Line Items]          
Line Of Credit Facility, Potential Maximum Borrowing Capacity 300,000,000        
Recourse Indebtedness [Member]          
Line of Credit Facility [Line Items]          
Line Of Credit Facility, Potential Increase Amount To Borrowing Capacity 20,000,000        
Non-recourse Indebtedness [Member]          
Line of Credit Facility [Line Items]          
Line Of Credit Facility, Potential Increase Amount To Borrowing Capacity $ 50,000,000        
Credit Agreement [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Leverage Ratio     40.00%    
Line of Credit [Member]          
Line of Credit Facility [Line Items]          
Commitment fee percentage condition one   0.20%      
Average daily used amount percentage condition one   50.00%      
Commitment fee percentage condition two   0.25%      
Average daily used amount percentage condition two   50.00%      
Line of Credit [Member] | Federal Funds Rate [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   0.50%      
Line of Credit [Member] | One-Month Eurodollar [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   1.00%      
Line of Credit [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Base Rate, Percent   0.00%      
Line of Credit [Member] | Standby Letters of Credit [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 20,000,000      
Line of Credit [Member] | Bridge Loan [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 25,000,000      
Minimum [Member] | Line of Credit [Member] | Eurodollar [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   1.75%      
Minimum [Member] | Line of Credit [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   0.55%      
Maximum [Member] | Line of Credit [Member] | Eurodollar [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   2.25%      
Maximum [Member] | Line of Credit [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Debt Instrument, Basis Spread on Variable Rate   1.05%      
[1] Such liabilities of Griffin-American Healthcare REIT IV, Inc. as of March 31, 2018 and December 31, 2017 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 Corporate Line of Credit, as defined in Note 7, held by Griffin-American Healthcare REIT IV Holdings, LP in the amount of $62,300,000 and $84,100,000 as of March 31, 2018 and December 31, 2017, respectively, which is guaranteed by Griffin-American Healthcare REIT IV, Inc.