Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary Information of Farms Additional Information (Detail)

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Real Estate and Intangible Assets - Summary Information of Farms Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
a
Jun. 30, 2017
USD ($)
a
lease
farm
Jun. 30, 2016
USD ($)
a
farm
shares
Dec. 31, 2016
USD ($)
Real Estate Properties [Line Items]        
Number of farms | farm   65 47  
Area leased (in acres) 23,456 57,930 23,456  
Farm acres (in acres)   46,971    
Net cost basis | $   $ 408,660,000    
Offering costs | $   $ 1,225,000 $ 252,000  
2017 New Real Estate Activity        
Real Estate Properties [Line Items]        
Number of farms | farm   7    
Area leased (in acres)   7,338    
2016 New Real Estate Activity        
Real Estate Properties [Line Items]        
Number of farms | farm     4  
Area leased (in acres) 6,644   6,644  
Direct leasing costs in connection with acquisitions | $ $ 5,000   $ 89,000  
2016 New Real Estate Activity | New Tenant Lease Agreement        
Real Estate Properties [Line Items]        
Direct leasing costs in connection with acquisitions | $     $ 4,670  
Arizona        
Real Estate Properties [Line Items]        
Number of farms | farm   6 2  
Area leased (in acres) 3,000 6,280 3,000  
Farm acres (in acres)   5,228    
Net cost basis | $   $ 40,748,000    
Arizona | 2017 New Real Estate Activity | In-place leases        
Real Estate Properties [Line Items]        
Number of leases | lease   4    
Arizona | 2017 New Real Estate Activity | In-place leases | Agricultural        
Real Estate Properties [Line Items]        
Number of leases | lease   3    
Arizona | State of Arizona        
Real Estate Properties [Line Items]        
Farm acres (in acres)   1,221    
Net cost basis | $   $ 3,500,000    
Arizona | State of Arizona | 2017 New Real Estate Activity        
Real Estate Properties [Line Items]        
Number of farms | farm   2    
Area leased (in acres)   1,368    
Arizona | State of Arizona | State Lease 1 | 2017 New Real Estate Activity        
Real Estate Properties [Line Items]        
Area leased (in acres)   485    
Arizona | State of Arizona | State Lease 2 | 2017 New Real Estate Activity        
Real Estate Properties [Line Items]        
Area leased (in acres)   883    
Yuma, AZ | Spot Road(4) | 2017 New Real Estate Activity        
Real Estate Properties [Line Items]        
Number of farms | farm   4    
Area leased (in acres)   3,280    
Yuma, AZ | Spot Road - Lease 1 | 2017 New Real Estate Activity | Agricultural        
Real Estate Properties [Line Items]        
Lease expiration date   Jun. 30, 2019    
Yuma, AZ | Spot Road - Lease 2 | 2017 New Real Estate Activity | Agricultural        
Real Estate Properties [Line Items]        
Lease expiration date   Sep. 15, 2026    
Yuma, AZ | Spot Road - Lease 3 | 2017 New Real Estate Activity | Agricultural        
Real Estate Properties [Line Items]        
Lease expiration date   Sep. 15, 2026    
Yuma, AZ | Spot Road Lease 4 | 2017 New Real Estate Activity | Residential        
Real Estate Properties [Line Items]        
Lease expiration date   Sep. 30, 2019    
Alamosa, CO | Gunbarrel Road | 2016 New Real Estate Activity        
Real Estate Properties [Line Items]        
Units issued as partial consideration of acquisition (in shares) | shares     745,879  
Fair value of units issued as partial consideration of acquisition | $ $ 6,500,000   $ 6,500,000  
Offering costs | $     $ 25,500  
Mortgage notes and bonds payable        
Real Estate Properties [Line Items]        
Unamortized deferred financing costs | $   $ 1,701,000   $ 1,412,000