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Line of Credit (Detail)
Aug. 25, 2016
USD ($)
Extension
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity   $ 100,000,000  
Line of Credit Facility, Collateral 750000000    
Line Of Credit Facility, Number Of Potential Extensions | Extension 1    
Line Of Credit Facility, Potential Extension Term 12 months    
Line Of Credit Facility, Potential Increase Amount To Borrowing Capacity $ 100,000,000    
Line Of Credit Facility, Potential Maximum Borrowing Capacity 200,000,000    
Line of Credit [1]   71,100,000 $ 33,900,000
Line of Credit Facility, Remaining Borrowing Capacity   $ 28,900,000 $ 66,100,000
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Debt, Weighted Average Interest Rate   4.16% 4.30%
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Line of credit facility, maximum borrowing capacity $ 100,000,000    
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 June 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 $71,100,000 and $33,900,000 as of June 30, 2017 and December 31, 2016, respectively, which is guaranteed by Griffin-American Healthcare REIT IV, Inc.