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Condensed Statements of Cash Flows (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities $ 742,193 $ 584,740 $ 626,648
Capital expenditures (909,400) (872,920) (497,000)
Net proceeds from sale or disposition of property and other 124,541 40,110 40,107
Investments 302 9,725 (10,302)
Net cash used in investing activities (782,661) (887,952) (464,545)
Issuance of short-term borrowings 9,500 20,100 0
Repayment of short-term borrowings 0 0 (20,000)
Issuance of long-term debt 507,924 467,957 300
Repayment of long-term debt (423,707) (138,775) (85,151)
Proceeds from issuance of common stock 14,554 88 5,744
Dividends paid (98,405) (159,768) (123,323)
Excess tax benefit on stock-based compensation 0 26 1,239
Net cash used in financing activities 36,866 189,628 (221,191)
Increase (decrease) in cash and cash equivalents (3,817) (113,730) (59,302)
Cash and cash equivalents - beginning of year 49,042 162,772 222,074
Cash and cash equivalents - end of year 45,225 49,042 162,772
MDU Resources Group, Inc. [Member]
      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 188,259 225,968 217,514
Capital expenditures (211,013) (150,337) (74,580)
Net proceeds from sale or disposition of property and other 20,624 1,120 720
Investments in and advances to subsidiaries (1,016) (1,387) (5,701)
Investments from and advances from subsidiaries 10,000 5,000 0
Investments 613 12 0
Net cash used in investing activities (180,792) (145,592) (79,561)
Repayment of short-term borrowings 0 0 (20,000)
Issuance of long-term debt 77,924 76,000 0
Repayment of long-term debt (85) (21) (107)
Proceeds from issuance of common stock 14,554 88 5,744
Dividends paid (98,405) (159,768) (123,323)
Excess tax benefit on stock-based compensation 0 21 358
Net cash used in financing activities (6,012) (83,680) (137,328)
Increase (decrease) in cash and cash equivalents 1,455 (3,304) 625
Cash and cash equivalents - beginning of year 3,596 6,900 6,275
Cash and cash equivalents - end of year $ 5,051 $ 3,596 $ 6,900