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Condensed Balance Sheets (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current assets:        
Cash and cash equivalents $ 45,225 $ 49,042 $ 162,772 $ 222,074
Receivables, net 713,067 678,123    
Inventories 282,391 317,415    
Deferred income taxes 25,048 22,846    
Prepayments and other current assets 49,510 42,351    
Total current assets 1,116,688 1,128,081    
Investments 112,939 103,243    
Property, plant and equipment 8,803,866 8,107,751    
Less accumulated depreciation, depletion and amortization 3,872,487 3,608,912 3,361,208  
Net property, plant and equipment 4,931,379 4,498,839 4,285,014  
Deferred charges and other assets:        
Goodwill 636,039 [1] 636,039 [1] 634,931 [1]  
Other 251,188 299,160    
Total deferred charges and other assets 900,326 952,328    
Total assets 7,061,332 6,682,491 6,556,125  
Current liabilities:        
Long-term debt due within one year 12,277 134,108    
Accounts payable 404,961 388,015    
Taxes payable 74,175 46,475    
Dividends payable 33,737 171    
Accrued compensation 69,661 48,448    
Other accrued liabilities 171,106 204,698    
Total current liabilities 784,900 850,115    
Long-term debt 1,842,286 1,610,867    
Deferred credits and other liabilities:        
Deferred income taxes 859,306 755,102    
Other liabilities 718,938 818,159    
Total deferred credits and other liabilities 1,578,244 1,573,261    
Equity:        
Preferred stocks 15,000 15,000    
Authorized - 500,000,000 shares, $1.00 par value        
Issued - 189,868,780 shares in 2013 and 189,369,450 shares in 2012 189,869 189,369    
Other paid-in capital 1,056,996 1,039,080    
Retained earnings 1,603,130 1,457,146    
Accumulated other comprehensive loss (38,205) (48,721) (47,001)  
Treasury stock at cost - 538,921 shares (3,626) (3,626)    
Total common stockholders' equity 2,808,164 2,633,248    
Total stockholders' equity 2,823,164 2,648,248    
Total liabilities and stockholders' equity 7,061,332 6,682,491    
Condensed Balance Sheet (Parenthetical)        
Common stock, shares authorized 500,000,000 500,000,000    
Common stock, par value $ 1.00 $ 1.00    
Common stock, shares issued 189,868,780 189,369,450    
Treasury stock, shares 538,921 538,921    
MDU Resources Group, Inc. [Member]
        
Current assets:        
Cash and cash equivalents 5,051 3,596 6,900 6,275
Receivables, net 88,529 89,238    
Accounts receivable from subsidiaries 31,372 2,957    
Inventories 29,312 41,469    
Deferred income taxes 3,196 3,685    
Prepayments and other current assets 14,231 9,120    
Total current assets 171,691 150,065    
Investments 60,687 52,123    
Investment in subsidiaries 2,380,829 2,253,294    
Property, plant and equipment 1,785,861 1,581,776    
Less accumulated depreciation, depletion and amortization 660,693 621,623    
Net property, plant and equipment 1,125,168 960,153    
Deferred charges and other assets:        
Goodwill 4,812 4,812    
Other 121,253 155,483    
Total deferred charges and other assets 126,065 160,295    
Total assets 3,864,440 3,575,930    
Current liabilities:        
Long-term debt due within one year 109 108    
Accounts payable 45,282 42,149    
Accounts payable to subsidiaries 4,839 6,423    
Taxes payable 12,337 12,399    
Dividends payable 33,737 171    
Accrued compensation 16,076 10,282    
Other accrued liabilities 28,042 29,490    
Total current liabilities 140,422 101,022    
Long-term debt 434,598 356,760    
Deferred credits and other liabilities:        
Deferred income taxes 205,639 172,769    
Other liabilities 260,617 297,131    
Total deferred credits and other liabilities 466,256 469,900    
Equity:        
Preferred stocks 15,000 15,000    
Authorized - 500,000,000 shares, $1.00 par value        
Issued - 189,868,780 shares in 2013 and 189,369,450 shares in 2012 189,869 189,369    
Other paid-in capital 1,056,996 1,039,080    
Retained earnings 1,603,130 1,457,146    
Accumulated other comprehensive loss (38,205) (48,721)    
Treasury stock at cost - 538,921 shares (3,626) (3,626)    
Total common stockholders' equity 2,808,164 2,633,248    
Total stockholders' equity 2,823,164 2,648,248    
Total liabilities and stockholders' equity $ 3,864,440 $ 3,575,930    
Condensed Balance Sheet (Parenthetical)        
Common stock, shares authorized 500,000,000 500,000,000    
Common stock, par value $ 1.00 $ 1.00    
Common stock, shares issued 189,868,780 189,369,450    
Treasury stock, shares 538,921 538,921    
[1] Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.