Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
a
Jun. 30, 2016
USD ($)
a
Jun. 30, 2017
USD ($)
a
farm
Jun. 30, 2016
USD ($)
a
farm
Sep. 30, 2015
a
Real Estate Properties [Line Items]          
No. of Farms | farm     65 47  
Total Acres | a 57,930 23,456 57,930 23,456  
% of Total Acres     100.00% 100.00%  
Rental Revenue | $ $ 5,994 $ 4,241 $ 11,742 $ 7,921  
% of Total Rental Revenue     100.00% 100.00%  
California          
Real Estate Properties [Line Items]          
No. of Farms | farm     22 19  
Total Acres | a 6,713 4,029 6,713 4,029 854
% of Total Acres     11.60% 17.20%  
Rental Revenue | $     $ 5,728 $ 4,502  
% of Total Rental Revenue     48.80% 56.80%  
Florida          
Real Estate Properties [Line Items]          
No. of Farms | farm     16 13  
Total Acres | a 9,315 5,094 9,315 5,094  
% of Total Acres     16.10% 21.70%  
Rental Revenue | $     $ 3,143 $ 1,539  
% of Total Rental Revenue     26.80% 19.40%  
Colorado          
Real Estate Properties [Line Items]          
No. of Farms | farm     9 3  
Total Acres | a 30,170 6,191 30,170 6,191  
% of Total Acres     52.10% 26.40%  
Rental Revenue | $     $ 1,345 $ 522  
% of Total Rental Revenue     11.40% 6.60%  
Oregon          
Real Estate Properties [Line Items]          
No. of Farms | farm     4 4  
Total Acres | a 2,313 2,313 2,313 2,313  
% of Total Acres     4.00% 9.90%  
Rental Revenue | $     $ 589 $ 585  
% of Total Rental Revenue     5.00% 7.40%  
Arizona          
Real Estate Properties [Line Items]          
No. of Farms | farm     6 2  
Total Acres | a 6,280 3,000 6,280 3,000  
% of Total Acres     10.80% 12.80%  
Rental Revenue | $     $ 512 $ 358  
% of Total Rental Revenue     4.30% 4.50%  
Nebraska          
Real Estate Properties [Line Items]          
No. of Farms | farm     2 2  
Total Acres | a 2,559 2,559 2,559 2,559  
% of Total Acres     4.40% 10.90%  
Rental Revenue | $     $ 290 $ 290  
% of Total Rental Revenue     2.50% 3.70%  
Michigan          
Real Estate Properties [Line Items]          
No. of Farms | farm     4 4  
Total Acres | a 270 270 270 270  
% of Total Acres     0.50% 1.10%  
Rental Revenue | $     $ 125 $ 125  
% of Total Rental Revenue     1.10% 1.60%  
North Carolina          
Real Estate Properties [Line Items]          
No. of Farms | farm     2 0  
Total Acres | a 310 0 310 0  
% of Total Acres     0.50% 0.00%  
Rental Revenue | $     $ 10 $ 0  
% of Total Rental Revenue     0.10% 0.00%