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Condensed Statements of Income and Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]      
Revenues $ 6,973,864 $ 5,680,733 $ 5,532,750
Operating expenses 6,399,911 5,146,514 4,987,825
Operating income 573,953 534,219 544,925
Other income 7,379 26,416 26,711
Interest expense 119,273 93,984 96,519
Income before income taxes 462,059 466,651 475,117
Income taxes 94,783 88,920 84,590
Income from continuing operations 367,276 377,731 390,527
Comprehensive income 377,910 385,205 384,229
MDU Resources Group, Inc. [Member]      
Condensed Financial Statements, Captions [Line Items]      
Revenues 0 0 0
Operating expenses 14,323 0 0
Operating income (14,323) 0 0
Other income 0 0 0
Interest expense 0 0 0
Income before income taxes (14,323) 0 0
Income taxes (1,623) 0 0
Equity in earnings of subsidiaries from continuing operations 379,976 377,731 390,527
Income from continuing operations 367,276 377,731 390,527
Equity in earnings (loss) of subsidiaries from discontinued operations 213 400 (322)
Net income 367,489 378,131 390,205
Comprehensive income $ 377,910 $ 385,205 $ 384,229