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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2015
participant
Sep. 30, 2016
USD ($)
a
acre ft
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
a
facility
acre ft
Sep. 30, 2015
USD ($)
Dec. 31, 2013
acre ft
Dec. 31, 2015
acre ft
Loss Contingencies [Line Items]                
Payments on water contracts         $ 8,529,000      
Long-term water assets (volume) | acre ft   51,880     51,880     49,018
Estimated future payments   $ 800,000     $ 800,000      
Number of community facility districts | facility         2      
Letter of credit period         2 years      
Letter of credit renewal period         2 years      
Payments for (proceeds from) communities facilities district and other investing activities   $ 0 $ 0 $ (4,162,000) $ 4,650,000 $ 4,971,000    
Special taxes paid         $ 1,292,000      
Tejon-Castac Water District | Kern Water Bank Authority                
Loss Contingencies [Line Items]                
Percentage of interest rate held   2.00%     2.00%      
Antelope Valley Groundwater Cases | Settled Litigation                
Loss Contingencies [Line Items]                
Number of parties in agreement for settlement | participant 140              
Percentage of current water usage with the adjudication boundary (more than) 99.00%              
West CFD                
Loss Contingencies [Line Items]                
Acres of land related to land liens | a   420     420      
Bond debt sold by TRPFFA   $ 28,620,000     $ 28,620,000      
Additional bond debt authorized to be sold in future   0     0      
Additional reimbursement funds   $ 0     $ 0      
East CFD                
Loss Contingencies [Line Items]                
Acres of land related to land liens | a   1,931     1,931      
Letters of credit outstanding amount   $ 55,000,000     $ 55,000,000      
Additional bond debt authorized to be sold in future   65,000,000     65,000,000      
Additional reimbursement funds   13,923,000     13,923,000      
Standby letter of credit                
Loss Contingencies [Line Items]                
Letters of credit outstanding amount   $ 5,426,000     5,426,000      
Annual cost related to letter of credit         $ 83,000      
DMB                
Loss Contingencies [Line Items]                
Contract renewal optional term         35 years   35 years  
Transferable water | DMB                
Loss Contingencies [Line Items]                
Long-term water assets (volume) | acre ft             6,693