Annual report pursuant to Section 13 and 15(d)

Mortgage Note Receivable - Additional Information (Detail)

v3.8.0.1
Mortgage Note Receivable - Additional Information (Detail)
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 31, 2015
Jun. 30, 2015
Apr. 14, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jul. 25, 2014
USD ($)
ft²
Debt Disclosure [Abstract]                
Second mortgage development loan $ 0 $ 0 $ 5,900,000       $ 5,600,000 $ 5,600,000
Property area | ft²               81,371
Interim financing loan           $ 300,000    
Percentage of Interest earned in cash (as percent)       9.00%        
Estimated percentage of rate of Interest (as percent)         22.00%      
Cash interest income and accrued exit fee revenue recognized 0 $ 385,000 $ 1,121,000          
Mortgage notes receivable $ 0