Long-Term Water Assets - Additional Information (Details)		9 Months Ended	12 Months Ended
	Aug. 06, 2015 USD ($) acre ft	Sep. 30, 2016 USD ($) $ / acre ft acre ft	Dec. 31, 2013 acre ft	Dec. 31, 2015 acre ft	Dec. 31, 2009 acre ft	Dec. 31, 2008 acre ft
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)		51,880		49,018
Water assets sales price | $		$ 9,601,000
Water sold (volume)		7,285
Cost of purchased water | $		$ 5,925,000
Amortization expense | $		$ 0
AVEK
Long Lived Assets Held For Sale [Line Items]
AVEK water bank		13,033		13,033	6,393	8,393
Transferable water with AVEK multiple		1.5			1.5
Water Returned (in acre feet)		13,592			8,587
AVEK water for future delivery		2,362		2,362
SWP water 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]
Contract renewal optional term		35 years	35 years
Consumer price per acre | $ / acre ft		695
DMB | Maximum
Long Lived Assets Held For Sale [Line Items]
Annual fee increase, percent		3.00%
DMB | Transferable water
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (volume)			6,693
PEF | Transferable water | Ranchcorp
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
PEF | Transferable water | Maximum | Ranchcorp
Long Lived Assets Held For Sale [Line Items]
Water assets, volume available for purchase in 2016 (up to)	2,000
Water assets, volume available for purchase from 2017-2030 (up to)	3,500