Long-Term Water Assets - Additional Information (Details)		3 Months Ended
	Aug. 06, 2015 USD ($) acre_foot	Mar. 31, 2016 USD ($) aft $ / acre_foot	Dec. 31, 2015 aft	Dec. 31, 2009 aft	Dec. 31, 2008 aft
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)		51,880	49,018
Contract renewal optional term		35 years
Water assets sales price | $		$ 7,791,000
Water sold (Volume)		5,954
Cost of purchased water | $		$ 4,215,000
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
Long Lived Assets Held For Sale [Line Items]
Consumer price per acre | $ / acre_foot		695
DMB | Transferable water
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)		6,693
Maximum | DMB
Long Lived Assets Held For Sale [Line Items]
Annual fee increase, percent		3.00%
Ranchcorp | PEF | Transferable water
Long Lived Assets Held For Sale [Line Items]
Annual fee increase, percent	3.00%
Annual option payment, percent	30.00%
Water assets sales price | $	$ 1,025
Ranchcorp | Maximum | PEF | Transferable water
Long Lived Assets Held For Sale [Line Items]
Water assets, volume available for purchase in 2016 (up to) | acre_foot	2,000
Water assets, volume available for purchase from 2017-2030 (up to) | acre_foot	3,500