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Regulatory matters - Approved Annual Revenue Increases (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Aug. 30, 2018 | Jul. 01, 2018 | May 01, 2018 | Jan. 01, 2018 | Jul. 01, 2017 | Jun. 07, 2017 | Mar. 01, 2016 | Nov. 30, 2018 | Mar. 31, 2017 | Dec. 31, 2018
Missouri Department of Public Utilities |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase | $ (17,837) | $ 4,600 |  |  |  |  |  |  |  |
New Hampshire Public Utilities Commission |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  | $ 10,711 |  |  |  |  |  |  |
Recoupment of difference between final and temporary rates |  |  |  |  | $ 1,326 |  |  | $ 280 |  |
Arizona Corporate Commission |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  |  | $ 2,367 |  |  |
Massachusetts Department of Public Utilities |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  | $ 3,676 |  |  |  | $ 7,800 |  | $ 500 | $ 8,300
California Public Utilities Commission |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  | $ 2,175 |  |  |  |  |  |
Illinois Commerce Commission |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  | $ 2,200 |  |  |  |
Various |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  |  |  |  |  | 3,048
Missouri Water System |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  |  |  |  |  | 1,015
Litchfield Park Water And Sewer |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  |  |  |  |  | 617
Park Water Georgia |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  |  |  |  |  | 1,531
Gas Rate Adjustment Mechanism |  |  |  |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Approved revenue increase |  |  |  |  |  |  |  |  |  | $ 115

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