Annual report pursuant to Section 13 and 15(d)

Schedule IV - Mortgage Loans on Real Estate (Detail)

v3.10.0.1
Schedule IV - Mortgage Loans on Real Estate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Jul. 25, 2014
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Face Amount of Mortgage $ 5,900        
Carrying Amount of Mortgage 0 $ 0 $ 0 $ 5,900 $ 5,600
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0        
Build To Suit Healthcare Facility [Member] | Phoenix,Arizona [Member] | Second Mortgage [Member]          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Interest Rate (as percent) 9.00%        
Internal rate of return on exit (as percent) 22.00%        
Loan bearing interest, terms 9% Current Interest, 22% internal rate of return on exit        
Final Maturity Date Jul. 31, 2016        
Periodic Payment Term 9.0% interest, paid in cash on the loan during construction and through maturity. Exit fee upon maturity of the loan in an amount sufficient to earn a 22% internal rate of return.        
Prior Lien $ 0        
Face Amount of Mortgage 5,600        
Carrying Amount of Mortgage 0        
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0        
Build To Suit Healthcare Facility [Member] | Phoenix,Arizona [Member] | Interim Financing Loan [Member]          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]          
Interest Rate (as percent) 22.00%        
Loan bearing interest, terms 22% Current Interest        
Final Maturity Date Apr. 30, 2016        
Periodic Payment Term 22.0% interest per annum through maturity, with all accrued interest and principal payable upon maturity.        
Prior Lien $ 0        
Face Amount of Mortgage 300        
Carrying Amount of Mortgage 0        
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0