Tangible Water Assets and Real Estate, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Real Estate [Abstract]
Real estate and improvements held and used, net of accumulated depreciation of $12,003 at each of June 30, 2019 and December 31, 2018	$ 9,469	$ 9,469
Other real estate inventories	3,522	5,207
Tangible water assets	29,607	29,622
Total real estate and tangible water assets	42,598	44,298
Accumulated depreciation on real estate and improvements held and used	$ 12,003	$ 12,003