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Condensed Statements of Cash Flows (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]      
Operating activities: $ 768,374 $ 542,280 $ 499,881
Capital expenditures (558,007) (576,065) (568,230)
Net proceeds from sale or disposition of property and other 35,557 29,812 26,100
Investments (1,814) (2,011) (2,321)
Net cash used in investing activities (630,243) (603,861) (710,907)
Issuance of long-term debt 116,973 599,455 566,829
Repayment of long-term debt (148,634) (468,917) (174,520)
Payments of stock issuance costs 0 0 (10)
Proceeds from issuance of common stock 3,385 106,848 0
Dividends paid (166,405) (160,256) (154,573)
Repurchase of common stock 0 0 (5,020)
Tax withholding on stock-based compensation (362) (3,015) (2,330)
Net cash used in financing activities (145,043) 74,092 230,376
Increase (decrease) in cash and cash equivalents (6,912) 12,511 19,349
Cash and cash equivalents - beginning of year 66,459 53,948 34,599
Cash and cash equivalents - end of year 59,547 66,459 53,948
MDU Resources Group, Inc. [Member]      
Condensed Financial Statements, Captions [Line Items]      
Operating activities: 226,642 168,520 294,379
Capital expenditures 0 0 (242,692)
Net proceeds from sale or disposition of property and other 0 0 5,032
Investments in and advances to subsidiaries (67,000) (120,000) (40,000)
Advances from subsidiaries 0 17,000 70,000
Investments (4) (236) (528)
Net cash used in investing activities (67,004) (103,236) (208,188)
Issuance of long-term debt 0 0 199,422
Repayment of long-term debt 0 0 (125,961)
Payments of stock issuance costs 0 0 (10)
Proceeds from issuance of common stock 3,385 106,848 0
Dividends paid (166,405) (160,256) (154,573)
Repurchase of common stock 0 0 (1,920)
Tax withholding on stock-based compensation (163) (1,821) (1,721)
Net cash used in financing activities (163,183) (55,229) (84,763)
Increase (decrease) in cash and cash equivalents (3,545) 10,055 1,428
Cash and cash equivalents - beginning of year 12,326 2,271 843
Cash and cash equivalents - end of year $ 8,781 $ 12,326 $ 2,271