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Business Combinations - Narrative (Details) $ / shares in Units, people in Thousands, $ in Thousands			12 Months Ended			15 Months Ended
	Dec. 17, 2021 USD ($) mi² serviceConnection people	Oct. 09, 2019 USD ($) $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Cash purchase price			$ 23,587	$ 0	$ 835,465
Goodwill			$ 640,471	628,144		$ 628,144
Share-based compensation related to business combination					$ 6,384
Kendall West Utility and Bandera East Utility
Business Acquisition [Line Items]
Cash purchase price	$ 23,587
Utility plant, net	9,400
Goodwill	$ 12,300
Kendall West Utility and Bandera East Utility | CLWSC
Business Acquisition [Line Items]
Number of people served from acquisition | people	5
Service area from acquisition | mi²	19
Kendall West Utility and Bandera East Utility | CLWSC | South Central Texas
Business Acquisition [Line Items]
Number of service connections from acquisition | serviceConnection	1,600
CTWS
Business Acquisition [Line Items]
Cash purchase price		$ 838,476
Utility plant, net		750,703		750,703		750,703
Goodwill		$ 626,523		$ 626,409		626,409
Acquiree's common shares converted in cash (in dollars per share) | $ / shares		$ 70.00
Cash received from acquisition		$ 3,011
Share-based compensation related to business combination		$ 6,384
Goodwill, measurement period adjustments						$ (114)

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