Long-Term Water Assets - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 $ / acre ft acre ft	Dec. 31, 2015 acre ft	Dec. 31, 2013 acre ft	Dec. 31, 2009 acre ft	Dec. 31, 2008 acre ft
Long Lived Assets Held For Sale [Line Items]
Contract renewal optional term	35 years
AVEK
Long Lived Assets Held For Sale [Line Items]
AVEK water bank (in acre-feet)				6,393	8,393
SWP contracts
Long Lived Assets Held For Sale [Line Items]
AVEK water for future delivery (in acre-feet)				3,444
DMB Pacific LLC
Long Lived Assets Held For Sale [Line Items]
Contract renewal optional term	35 years
Consumer price per acre (per acre-foot) | $ / acre ft	769
DMB Pacific LLC | Maximum
Long Lived Assets Held For Sale [Line Items]
Annual fee increase, percent	3.00%
DMB Pacific LLC | Transferable water
Long Lived Assets Held For Sale [Line Items]
Long-term water assets (Volume) (in acre-feet)	6,693		6,693
PEF | Transferable water | Ranchcorp
Long Lived Assets Held For Sale [Line Items]
Consumer price per acre (per acre-foot) | $ / acre ft	1,120
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) (in acre-feet)		3,500