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Schedule of Indebtedness (Parenthetical) (Detail) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
30-day LIBOR      
Debt Instrument [Line Items]      
Interest accrues on loan, LIBOR   0.77% 0.43%
Ninety Days London Interbank Offered Rate      
Debt Instrument [Line Items]      
Interest accrues on loan, LIBOR   1.00% 0.61%
Mortgage Loans | Northwest Medical Park      
Debt Instrument [Line Items]      
Notional amount of derivative contract   $ 6,900,000  
Mortgage Loans | Knoxville MOBs      
Debt Instrument [Line Items]      
Notional amount of derivative contract   37,400,000  
Mortgage Loans | Calvert Medical Office Properties      
Debt Instrument [Line Items]      
Notional amount of derivative contract   25,500,000  
Mortgage Loans | Medical Portfolio I Properties      
Debt Instrument [Line Items]      
Notional amount of derivative contract   82,400,000  
Mortgage Loans | Southeast Medical Office Properties      
Debt Instrument [Line Items]      
Notional amount of derivative contract   134,300,000  
Mortgage Loans | Variable Rate Debt | Claremont Medical Office      
Debt Instrument [Line Items]      
Remaining loan discount   200,000  
Mortgage Loans | 3-year forward interest rate swap | Claremont Medical Office      
Debt Instrument [Line Items]      
Notional amount of derivative contract   $ 12,100,000  
Derivative contract, maturity period   3 years  
Mortgage Loans | 3-year forward interest rate swap | Houston Orthopedic And Spine Hospital      
Debt Instrument [Line Items]      
Notional amount of derivative contract   $ 48,000,000  
Derivative contract, maturity period   3 years  
Construction Loan | 30-day LIBOR      
Debt Instrument [Line Items]      
Interest accrues on loan in addition to LIBOR [1]   2.50%  
Watercrest at Mansfield | Mortgage Loans      
Debt Instrument [Line Items]      
Monthly principal and interest payment   $ 143,330  
Watercrest at Mansfield | Mortgage Loans | Fixed rate debt      
Debt Instrument [Line Items]      
Remaining loan premium   $ 300,000  
Pacific Northwest II Communities | Mortgage Loans | Minimum      
Debt Instrument [Line Items]      
Percentage of prepayment penalty on principal repaid   1.00%  
ProMed Building I | Mortgage Loans | 30-day LIBOR      
Debt Instrument [Line Items]      
Interest accrues on loan in addition to LIBOR   2.20%  
Primrose I Communities | Mortgage Loans | Minimum | If prepaid prior to March 1, 2022      
Debt Instrument [Line Items]      
Percentage of prepayment penalty on principal repaid   1.00%  
540 New Waverly Place | Mortgage Loans | Fixed rate debt      
Debt Instrument [Line Items]      
Remaining loan premium   $ 100,000  
Raider Ranch Development | Construction Loan      
Debt Instrument [Line Items]      
Extinguishment of outstanding debt $ 9,700,000    
Write off of unamortized loan cost   100,000  
Wellmore of Tega Cay | Construction Loan      
Debt Instrument [Line Items]      
Extinguishment of outstanding debt $ 24,700,000    
Write off of unamortized loan cost   300,000  
Payments of Debt Extinguishment Costs   $ 1,100,000  
[1] The 30-day and 90-day LIBOR were approximately 0.77% and 1.00%, respectively, as of December 31, 2016 and approximately 0.43% and 0.61%, respectively, as of December 31, 2015.