Related Party Arrangements - Narrative - Contributions, Settlement and Release Agreements (Details) - Texas Water Code [Member] - Company Subsidiaries and Property Manager [Member]	12 Months Ended
Dec. 31, 2018 USD ($) lawsuit
Related Party Transaction [Line Items]
Number of Class Action Lawsuits \| lawsuit	2
Litigation settlement amount	$ 378,405
Loss contingency accrual	$ 305,000

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration