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Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Income from continuing operations | $ 377,731 | $ 390,527 | $ 335,166
Comprehensive income | 385,205 | 384,229 | 331,693
MDU Resources Group, Inc. [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Equity in earnings of subsidiaries from continuing operations | 377,731 | 390,527 | 335,166
Income from continuing operations | 377,731 | 390,527 | 335,166
Equity in earnings (loss) of subsidiaries from discontinued operations | 400 | (322) | 287
Net income | 378,131 | 390,205 | 335,453
Comprehensive income | $ 385,205 | $ 384,229 | $ 331,693

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