Tangible Water Assets and Real Estate, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Real Estate [Abstract]
Real estate and improvements held and used, net of accumulated depreciation of $12,003 at each of March 31, 2019 and December 31, 2018	$ 9,469	$ 9,469
Other real estate inventories	3,522	5,207
Tangible water assets	29,615	29,622
Total real estate and tangible water assets	42,606	44,298
Accumulated depreciation on real estate and improvements held and used	$ 12,003	$ 12,003