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Schedule I - Condensed Financial Information of Registrant - Condensed Statements of Income and Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]      
Revenues from contracts with customers $ 1,752,995 $ 1,805,807 $ 1,754,158
Operating expenses 1,492,336 1,578,408 1,546,428
Operating income 265,642 224,944 200,870
Realized gain on tax-free exchange of the retained shares in Knife River 0 186,556 0
Interest expense 108,347 104,624 80,683
Income before income taxes 198,662 340,330 123,447
Income taxes 17,589 10,213 6,195
Income from continuing operations 181,073 330,117 117,252
Discontinued operations, net of tax 100,035 84,590 250,237
Net income 281,108 414,707 367,489
Comprehensive income attributable to common stockholders 282,694 414,600 377,910
MDU Resources Group, Inc.      
Condensed Financial Statements, Captions [Line Items]      
Revenues from contracts with customers 0 0 0
Operating expenses 4,416 9,668 1,636
Operating income (4,416) (9,668) (1,636)
Realized gain on tax-free exchange of the retained shares in Knife River 0 186,556 0
Interest expense 642 7,109 0
Income before income taxes (5,058) 169,779 (1,636)
Income taxes (2,324) (4,220) (400)
Equity in earnings of subsidiaries from continuing operations 183,807 156,118 118,488
Income from continuing operations 181,073 330,117 117,252
Equity in earnings of subsidiaries from discontinued operations 140,042 143,181 261,701
Discontinued operations, net of tax (40,007) (58,591) (11,464)
Net income 281,108 414,707 367,489
Comprehensive income attributable to common stockholders $ 282,694 $ 414,600 $ 377,910