Long-Term Water Assets - Additional Information (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2016 USD ($) aft	Mar. 31, 2016 aft	Sep. 30, 2014	Sep. 30, 2015 USD ($) aft	Sep. 30, 2014	Dec. 31, 2015 $ / acre_foot	Dec. 31, 2014 aft	Dec. 31, 2009 aft	Dec. 31, 2008 aft
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)				49,018			49,461
Contract renewal optional term					35 years
Water sold (Volume)				7,922
Water assets sales price | $				$ 10,165,000
Cost of purchased water | $				$ 5,483,000
Transferable water
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)				22,179
AVEK
Long Lived Assets Held For Sale [Line Items]
AVEK water bank				13,033			13,033	6,393	8,393
AVEK water for future delivery				2,362			2,362
SWP contracts
Long Lived Assets Held For Sale [Line Items]
AVEK water for future delivery								3,444
DMB | Transferable water
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)				6,693
Scenario, Forecast
Long Lived Assets Held For Sale [Line Items]
Water sold (Volume)		500
Scenario, Forecast | DMB
Long Lived Assets Held For Sale [Line Items]
Consumer price per acre | $ / acre_foot						675
Maximum | DMB
Long Lived Assets Held For Sale [Line Items]
Annual fee increase, percent			3.00%
Ranchcorp | Scenario, Forecast | PEF | Transferable water
Long Lived Assets Held For Sale [Line Items]
Annual option payment, percent	30.00%
Annual fee increase, percent	3.00%
Water assets sales price | $	$ 1,025
Ranchcorp | Minimum | Scenario, Forecast | PEF | Transferable water
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)	2,000
Ranchcorp | Maximum | Scenario, Forecast | PEF | Transferable water
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)	4,000