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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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