Tangible Water Assets and Real Estate, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Real estate and improvements held and used, net of accumulated depreciation of $12,003 at March 31, 2018 and December 31, 2017, respectively	$ 9,469	$ 9,469
Other real estate inventories	5,379	5,551
Tangible water assets	29,648	29,655
Total real estate and tangible water assets	44,496	44,675
Accumulated depreciation on real estate and improvements held and used	$ 12,003	$ 12,003