Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Summary of Geographic Locations of Properties (Detail)

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Real Estate and Intangible Assets - Summary of Geographic Locations of Properties (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
a
farm
Dec. 31, 2016
USD ($)
a
farm
Dec. 31, 2015
USD ($)
Sep. 30, 2015
a
Real Estate Properties [Line Items]        
No. of Farms | farm 73 58    
Total Acres | a 63,014 50,592    
Total acres (as percent) 100.00% 100.00%    
Rental revenue | $ $ 25,111 $ 17,306 $ 11,888  
Total rental revenue (as percent) 100.00% 100.00%    
California        
Real Estate Properties [Line Items]        
No. of Farms | farm 28 22    
Total Acres | a 8,080 6,713   854
Total acres (as percent) 12.80% 13.30%    
Rental revenue | $ $ 12,000 $ 9,829    
Total rental revenue (as percent) 47.80% 56.80%    
Florida        
Real Estate Properties [Line Items]        
No. of Farms | farm 16 15    
Total Acres | a 11,006 5,567    
Total acres (as percent) 17.50% 11.00%    
Rental revenue | $ $ 6,600 $ 3,293    
Total rental revenue (as percent) 26.20% 19.00%    
Colorado        
Real Estate Properties [Line Items]        
No. of Farms | farm 10 9    
Total Acres | a 31,450 30,170    
Total acres (as percent) 49.90% 59.60%    
Rental revenue | $ $ 2,700 $ 1,453    
Total rental revenue (as percent) 10.80% 8.40%    
Arizona        
Real Estate Properties [Line Items]        
No. of Farms | farm 6 2    
Total Acres | a 6,280 3,000    
Total acres (as percent) 10.00% 5.90%    
Rental revenue | $ $ 1,572 $ 729    
Total rental revenue (as percent) 6.30% 4.20%    
Oregon        
Real Estate Properties [Line Items]        
No. of Farms | farm 4 4    
Total Acres | a 2,313 2,313    
Total acres (as percent) 3.70% 4.60%    
Rental revenue | $ $ 1,189 $ 1,172    
Total rental revenue (as percent) 4.70% 6.80%    
Nebraska        
Real Estate Properties [Line Items]        
No. of Farms | farm 2 2    
Total Acres | a 2,559 2,559    
Total acres (as percent) 4.00% 5.10%    
Rental revenue | $ $ 580 $ 580    
Total rental revenue (as percent) 2.30% 3.40%    
Michigan        
Real Estate Properties [Line Items]        
No. of Farms | farm 4 4    
Total Acres | a 270 270    
Total acres (as percent) 0.40% 0.50%    
Rental revenue | $ $ 249 $ 250    
Total rental revenue (as percent) 1.00% 1.40%    
Washington        
Real Estate Properties [Line Items]        
No. of Farms | farm 1 0    
Total Acres | a 746 0    
Total acres (as percent) 1.20% 0.00%    
Rental revenue | $ $ 152 $ 0    
Total rental revenue (as percent) 0.60% 0.00%    
North Carolina        
Real Estate Properties [Line Items]        
No. of Farms | farm 2 0    
Total Acres | a 310 0    
Total acres (as percent) 0.50% 0.00%    
Rental revenue | $ $ 74 $ 0    
Total rental revenue (as percent) 0.30% 0.00%