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Condensed Statements of Cash Flows (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities $ 641,144 $ 603,667 $ 754,308
Capital expenditures (625,375) (608,028) (531,332)
Net proceeds from sale or disposition of property and other 54,569 29,598 40,802
Investments 1,515 (1,041) 302
Net cash used in investing activities (382,453) (904,191) (782,661)
Issuance of long-term debt 345,920 606,084 507,924
Repayment of long-term debt (569,498) (368,249) (423,707)
Proceeds from issuance of common stock 21,898 150,060 14,554
Dividends paid (142,835) (136,712) (98,405)
Excess tax benefit on stock-based compensation 0 4,729 0
Tax withholding on stock-based compensation 0 (5,564) 0
Net cash provided by financing activities (255,730) 325,194 36,866
Increase (decrease) in cash and cash equivalents 2,736 24,515 8,298
Cash and cash equivalents - beginning of year 81,855 57,340 49,042
Cash and cash equivalents - end of year 84,591 81,855 57,340
MDU Resources Group, Inc. [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 255,273 208,208 188,259
Capital expenditures (349,985) (223,251) (211,013)
Net proceeds from sale or disposition of property and other 3,268 1,552 20,624
Investments in and advances to subsidiaries (7,000) (134,451) (1,016)
Advances from subsidiaries 100,000 64,500 10,000
Investments 5 (794) 613
Net cash used in investing activities (253,712) (292,444) (180,792)
Issuance of long-term debt 224,185 148,959 77,924
Repayment of long-term debt (108,008) (76,432) (85)
Proceeds from issuance of common stock 21,898 150,060 14,554
Dividends paid (142,835) (136,712) (98,405)
Excess tax benefit on stock-based compensation 0 3,326 0
Tax withholding on stock-based compensation 0 (3,896) 0
Net cash provided by financing activities (4,760) 85,305 (6,012)
Increase (decrease) in cash and cash equivalents (3,199) 1,069 1,455
Cash and cash equivalents - beginning of year 6,120 5,051 3,596
Cash and cash equivalents - end of year $ 2,921 $ 6,120 $ 5,051