Long-Term Water Assets - Narrative (Details)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) aft	Jun. 30, 2014 USD ($)	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 | $	$ 312,000	$ 10,165,000	$ 7,703,000
Cost of purchased water | $	$ 135,000	$ 5,483,000	$ 4,524,000
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 | 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%