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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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