Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - 2017 Acquisitions (Detail)

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Real Estate and Intangible Assets - 2017 Acquisitions (Detail)
1 Months Ended 12 Months Ended 20 Months Ended
Aug. 09, 2017
USD ($)
Aug. 31, 2017
USD ($)
a
Dec. 31, 2017
USD ($)
a
farm
option
lease
Dec. 31, 2016
USD ($)
a
farm
Dec. 31, 2015
USD ($)
Mar. 31, 2019
USD ($)
Real Estate Properties [Line Items]            
Number of farms | farm     73 58    
Total Acres | a     63,014 50,592    
New Long-term Debt Issued     $ 302,988,000      
Number of leases | lease     1      
Payments to develop real estate assets     $ 5,211,000 $ 9,797,000 $ 3,231,000  
Rental revenue     $ 25,111,000 $ 17,306,000 $ 11,888,000  
Arizona            
Real Estate Properties [Line Items]            
Number of farms | farm     6 2    
Total Acres | a     6,280 3,000    
New Long-term Debt Issued     $ 23,333,000      
Rental revenue     $ 1,572,000 $ 729,000    
2017 New Real Estate Activity            
Real Estate Properties [Line Items]            
Number of farms | farm     16      
Total Acres | a     12,641      
Total Purchase Price     $ 128,672,000      
Acquisition costs     554,000      
Annualized straight line rent escalations     7,109,000      
New Long-term Debt Issued     75,763,000      
Rental revenue     4,500,000      
Earnings     $ 1,100,000      
2017 New Real Estate Activity | Arizona | State of Arizona            
Real Estate Properties [Line Items]            
Number of farms | farm     2      
Total Acres | a     1,368      
2017 New Real Estate Activity | Citrus Boulevard | Martin, FL            
Real Estate Properties [Line Items]            
Number of farms | farm     1      
Acquisition Date     Jan. 12, 2017      
Total Acres | a     3,748      
Lessee term     7 years      
Number of renewal options | option     3      
Term of renewal     5 years      
Total Purchase Price     $ 54,000,000      
Acquisition costs     80,000      
Annualized straight line rent escalations     2,926,000      
New Long-term Debt Issued     $ 32,400,000      
2017 New Real Estate Activity | Spot Road | Yuma, AZ            
Real Estate Properties [Line Items]            
Number of farms | farm     4      
Acquisition Date     Jun. 01, 2017      
Total Acres | a     3,280      
Total Purchase Price     $ 27,500,000      
Acquisition costs     88,000      
Annualized straight line rent escalations     1,672,000      
New Long-term Debt Issued     $ 15,300,000      
2017 New Real Estate Activity | Spot Road | Yuma, AZ | Lease One            
Real Estate Properties [Line Items]            
Number of renewal options | option     1      
Term of renewal     10 years      
2017 New Real Estate Activity | Spot Road | Yuma, AZ | Lease Two            
Real Estate Properties [Line Items]            
Number of renewal options | option     1      
Term of renewal     2 years      
2017 New Real Estate Activity | Spot Road | Yuma, AZ | Weighted average            
Real Estate Properties [Line Items]            
Lessee term     8 years 6 months 19 days      
2017 New Real Estate Activity | Poplar Street | Bladen, NC            
Real Estate Properties [Line Items]            
Number of farms | farm     2      
Acquisition Date     Jun. 02, 2017      
Total Acres | a     310      
Number of renewal options | option     1      
Term of renewal     5 years      
Total Purchase Price     $ 2,169,000      
Acquisition costs     49,000      
Annualized straight line rent escalations     122,000      
New Long-term Debt Issued     $ 1,301,000      
2017 New Real Estate Activity | Poplar Street | Bladen, NC | Weighted average            
Real Estate Properties [Line Items]            
Lessee term     9 years 6 months 29 days      
2017 New Real Estate Activity | Phelps Avenue | Fresno, CA            
Real Estate Properties [Line Items]            
Number of farms | farm     4      
Acquisition Date     Jul. 17, 2017      
Total Acres | a     847      
Number of renewal options | option     1      
Term of renewal     5 years      
Total Purchase Price     $ 13,603,000      
Acquisition costs     43,000      
Annualized straight line rent escalations     681,000      
New Long-term Debt Issued     $ 8,162,000      
2017 New Real Estate Activity | Phelps Avenue | Fresno, CA | Weighted average            
Real Estate Properties [Line Items]            
Lessee term     10 years 3 months 15 days      
2017 New Real Estate Activity | Parrot Avenue | Okeechobee, FL            
Real Estate Properties [Line Items]            
Number of farms | farm     1      
Acquisition Date     Aug. 09, 2017      
Total Acres | a   1,910        
Number of renewal options | option     0      
Total Purchase Price     $ 9,700,000      
Acquisition costs     67,000      
Annualized straight line rent escalations     488,000      
New Long-term Debt Issued     $ 5,820,000      
2017 New Real Estate Activity | Parrot Avenue | Okeechobee, FL | Forecast            
Real Estate Properties [Line Items]            
Payments to develop real estate assets           $ 1,000,000
2017 New Real Estate Activity | Parrot Avenue | Okeechobee, FL | Tenant Two            
Real Estate Properties [Line Items]            
Lessee term 6 years          
Number of renewal options | option     2      
Term of renewal     6 years      
Annualized straight line rent escalations $ 542,000          
2017 New Real Estate Activity | Parrot Avenue | Okeechobee, FL | Tenant One            
Real Estate Properties [Line Items]            
Lessee term 7 months          
2017 New Real Estate Activity | Parrot Avenue | Okeechobee, FL | Weighted average            
Real Estate Properties [Line Items]            
Lessee term     6 months 17 days      
2017 New Real Estate Activity | Cat Canyon Road | Santa Barbara, CA            
Real Estate Properties [Line Items]            
Number of farms | farm     1      
Acquisition Date     Aug. 30, 2017      
Total Acres | a   361        
Number of renewal options | option     2      
Term of renewal     5 years      
Total Purchase Price     $ 5,375,000      
Acquisition costs     112,000      
Annualized straight line rent escalations     320,000      
New Long-term Debt Issued     $ 3,225,000      
Payments to develop real estate assets   $ 4,000,000        
2017 New Real Estate Activity | Cat Canyon Road | Santa Barbara, CA | Weighted average            
Real Estate Properties [Line Items]            
Lessee term     9 years 9 months 4 days      
2017 New Real Estate Activity | Oasis Road | Walla Walla, WA            
Real Estate Properties [Line Items]            
Number of farms | farm     1      
Acquisition Date     Sep. 08, 2017      
Total Acres | a     746      
Number of renewal options | option     0      
Total Purchase Price     $ 9,500,000      
Acquisition costs     45,000      
Annualized straight line rent escalations     484,000      
New Long-term Debt Issued     $ 5,460,000      
2017 New Real Estate Activity | Oasis Road | Walla Walla, WA | Weighted average            
Real Estate Properties [Line Items]            
Lessee term     6 years 3 months 7 days      
2017 New Real Estate Activity | JJ Road | Baca, CO            
Real Estate Properties [Line Items]            
Number of farms | farm     1      
Acquisition Date     Oct. 02, 2017      
Total Acres | a     1,280      
Number of renewal options | option     1      
Term of renewal     5 years      
Total Purchase Price     $ 900,000      
Acquisition costs     26,000      
Annualized straight line rent escalations     52,000      
New Long-term Debt Issued     $ 540,000      
2017 New Real Estate Activity | JJ Road | Baca, CO | Weighted average            
Real Estate Properties [Line Items]            
Lessee term     4 years 3 months      
2017 New Real Estate Activity | Jayne Avenue | Fresno, CA            
Real Estate Properties [Line Items]            
Number of farms | farm     1      
Total Acres | a     159      
Number of renewal options | option     2      
Term of renewal     5 years      
Total Purchase Price     $ 5,925,000      
Acquisition costs     44,000      
Annualized straight line rent escalations     364,000      
New Long-term Debt Issued     $ 3,555,000      
2017 New Real Estate Activity | Jayne Avenue | Fresno, CA | Weighted average            
Real Estate Properties [Line Items]            
Lessee term     19 years 10 months 17 days      
February 2022 | 2017 New Real Estate Activity | Arizona | State of Arizona            
Real Estate Properties [Line Items]            
Total Acres | a     485      
February 2025 | 2017 New Real Estate Activity | Arizona | State of Arizona            
Real Estate Properties [Line Items]            
Total Acres | a     883