Annual report pursuant to Section 13 and 15(d)

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

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Real Estate and Intangible Assets - Summary Information of Farms (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
a
farm
Dec. 31, 2016
USD ($)
a
farm
Sep. 30, 2015
a
Real Estate Properties [Line Items]      
Number of farms | farm 73 58  
Total Acres | a 63,014 50,592  
Farm Acres | a 50,894    
Net Cost Basis $ 451,864    
Encumbrances $ 302,988    
California      
Real Estate Properties [Line Items]      
Number of farms | farm 28 22  
Total Acres | a 8,080 6,713 854
Farm Acres | a 7,308    
Net Cost Basis $ 208,774    
Encumbrances $ 152,860    
Florida      
Real Estate Properties [Line Items]      
Number of farms | farm 16 15  
Total Acres | a 11,006 5,567  
Farm Acres | a 8,846    
Net Cost Basis $ 114,225    
Encumbrances $ 73,264    
Colorado      
Real Estate Properties [Line Items]      
Number of farms | farm 10 9  
Total Acres | a 31,450 30,170  
Farm Acres | a 24,513    
Net Cost Basis $ 42,409    
Encumbrances $ 25,579    
Oregon      
Real Estate Properties [Line Items]      
Number of farms | farm 4 4  
Total Acres | a 2,313 2,313  
Farm Acres | a 2,003    
Net Cost Basis $ 19,806    
Encumbrances $ 12,978    
Arizona      
Real Estate Properties [Line Items]      
Number of farms | farm 6 2  
Total Acres | a 6,280 3,000  
Farm Acres | a 5,228    
Net Cost Basis $ 41,341    
Encumbrances $ 23,333    
Nebraska      
Real Estate Properties [Line Items]      
Number of farms | farm 2 2  
Total Acres | a 2,559 2,559  
Farm Acres | a 2,101    
Net Cost Basis $ 10,626    
Encumbrances $ 6,602    
Washington      
Real Estate Properties [Line Items]      
Number of farms | farm 1 0  
Total Acres | a 746 0  
Farm Acres | a 417    
Net Cost Basis $ 9,386    
Encumbrances $ 5,412    
Michigan      
Real Estate Properties [Line Items]      
Number of farms | farm 4 4  
Total Acres | a 270 270  
Farm Acres | a 183    
Net Cost Basis $ 2,936    
Encumbrances $ 1,659    
North Carolina      
Real Estate Properties [Line Items]      
Number of farms | farm 2 0  
Total Acres | a 310 0  
Farm Acres | a 295    
Net Cost Basis $ 2,361    
Encumbrances 1,301    
Long-term mortgage notes and bonds payable      
Real Estate Properties [Line Items]      
Deferred financing costs related to mortgage notes and bonds payable $ 1,986 $ 1,412  
State of Arizona | Arizona      
Real Estate Properties [Line Items]      
Farm Acres | a 1,221    
Net Cost Basis $ 3,200    
2015 New Real Estate Activity      
Real Estate Properties [Line Items]      
Annualized straight line rent escalations   $ 5,374  
2017 New Real Estate Activity      
Real Estate Properties [Line Items]      
Number of farms | farm 16    
Total Purchase Price $ 128,672    
Acquisition Costs 554    
Annualized straight line rent escalations $ 7,109    
Total Acres | a 12,641    
Encumbrances $ 75,763    
2017 New Real Estate Activity | State of Arizona | Arizona      
Real Estate Properties [Line Items]      
Number of farms | farm 2    
Total Acres | a 1,368