Investments in Water Assets - Additional Information (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Aug. 06, 2015 $ / acre ft	Mar. 31, 2017 USD ($) $ / acre ft acre ft	Dec. 31, 2013 acre ft	Dec. 31, 2016 acre ft	Dec. 31, 2009 acre ft	Dec. 31, 2008 acre ft
Long Lived Assets Held-for-sale [Line Items]
Water assets sales price | $		$ 1,109
Water sold (volume)		939
Cost of purchased water | $		$ 765
Transferable water
Long Lived Assets Held-for-sale [Line Items]
AVEK water bank		13,049
AVEK
Long Lived Assets Held-for-sale [Line Items]
AVEK water bank		13,033,000		13,033,000	6,393	8,393
Transferable water with AVEK multiple		1.5			1.5
AVEK water for future delivery		5,316,000		2,362,000
Transferable water		11,235
AVEK | Transferable water
Long Lived Assets Held-for-sale [Line Items]
AVEK water bank		7,295
Transferable water with AVEK multiple		1.5
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		716
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]
Consumer price per acre | $ / acre ft	1,056
Annual fee increase, percent	3.00%
Annual option payment, percent	30.00%
PEF | Transferable water | Maximum | Ranchcorp
Long Lived Assets Held-for-sale [Line Items]
Water assets, volume available for purchase from 2017-2030 (up to)		3,500