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Condensed Balance Sheets (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 81,855us-gaap_CashAndCashEquivalentsAtCarryingValue		$ 45,225us-gaap_CashAndCashEquivalentsAtCarryingValue		$ 49,042us-gaap_CashAndCashEquivalentsAtCarryingValue		$ 162,772us-gaap_CashAndCashEquivalentsAtCarryingValue
Receivables, net	693,318us-gaap_ReceivablesNetCurrent		713,067us-gaap_ReceivablesNetCurrent
Inventories	300,811us-gaap_InventoryNet		282,391us-gaap_InventoryNet
Deferred income taxes	23,806us-gaap_DeferredTaxAssetsNetCurrent		25,048us-gaap_DeferredTaxAssetsNetCurrent
Prepayments and other current assets	76,848us-gaap_OtherAssetsCurrent		49,510us-gaap_OtherAssetsCurrent
Total current assets	1,194,973us-gaap_AssetsCurrent		1,116,688us-gaap_AssetsCurrent
Investments	117,920us-gaap_LongTermInvestments		112,939us-gaap_LongTermInvestments
Property, plant and equipment	9,693,171us-gaap_PropertyPlantAndEquipmentGross		8,803,866us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, depletion and amortization	4,166,407us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		3,872,487us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment		3,608,912us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment	5,526,764us-gaap_PropertyPlantAndEquipmentNet		4,931,379us-gaap_PropertyPlantAndEquipmentNet		4,498,839us-gaap_PropertyPlantAndEquipmentNet
Deferred charges and other assets:
Goodwill	635,204us-gaap_Goodwill	[1]	636,039us-gaap_Goodwill	[1]	636,039us-gaap_Goodwill	[1]
Other	325,277us-gaap_OtherAssetsNoncurrent		251,188us-gaap_OtherAssetsNoncurrent
Total deferred charges and other assets	970,321mdu_TotalDeferredChargesAndOtherAssets		900,326mdu_TotalDeferredChargesAndOtherAssets
Total assets	7,809,978us-gaap_Assets		7,061,332us-gaap_Assets		6,682,491us-gaap_Assets
Current liabilities:
Long-term debt due within one year	269,449us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent		12,277us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Accounts payable	382,671us-gaap_AccountsPayableCurrent		404,961us-gaap_AccountsPayableCurrent
Taxes payable	45,631us-gaap_TaxesPayableCurrent		74,175us-gaap_TaxesPayableCurrent
Dividends payable	35,607us-gaap_DividendsPayableCurrent		33,737us-gaap_DividendsPayableCurrent
Accrued compensation	62,775us-gaap_AccruedSalariesCurrent		69,661us-gaap_AccruedSalariesCurrent
Other accrued liabilities	172,561us-gaap_OtherLiabilitiesCurrent		171,106us-gaap_OtherLiabilitiesCurrent
Total current liabilities	968,694us-gaap_LiabilitiesCurrent		784,900us-gaap_LiabilitiesCurrent
Long-term debt	1,825,278us-gaap_LongTermDebtAndCapitalLeaseObligations		1,842,286us-gaap_LongTermDebtAndCapitalLeaseObligations
Deferred credits and other liabilities:
Deferred income taxes	952,413us-gaap_DeferredTaxLiabilitiesNoncurrent		859,306us-gaap_DeferredTaxLiabilitiesNoncurrent
Other liabilities	813,809us-gaap_OtherLiabilitiesNoncurrent		718,938us-gaap_OtherLiabilitiesNoncurrent
Total deferred credits and other liabilities	1,766,222us-gaap_LiabilitiesNoncurrent		1,578,244us-gaap_LiabilitiesNoncurrent
Equity:
Preferred stocks	15,000us-gaap_PreferredStockValue		15,000us-gaap_PreferredStockValue
Authorized - 500,000,000 shares, $1.00 par value
Issued - 194,754,812 shares in 2014 and 189,868,780 shares in 2013	194,755us-gaap_CommonStockValue		189,869us-gaap_CommonStockValue
Other paid-in capital	1,207,188us-gaap_AdditionalPaidInCapitalCommonStock		1,056,996us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings	1,762,827us-gaap_RetainedEarningsAccumulatedDeficit		1,603,130us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss	(42,103)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		(38,205)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		(48,721)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Treasury stock at cost - 538,921 shares	(3,626)us-gaap_TreasuryStockValue		(3,626)us-gaap_TreasuryStockValue
Total common stockholders' equity	3,119,041mdu_Commonequitystockholders		2,808,164mdu_Commonequitystockholders
Total stockholders' equity	3,134,041us-gaap_StockholdersEquity		2,823,164us-gaap_StockholdersEquity
Total liabilities and equity	7,809,978us-gaap_LiabilitiesAndStockholdersEquity		7,061,332us-gaap_LiabilitiesAndStockholdersEquity
Condensed Balance Sheet (Parenthetical)
Common stock, shares authorized	500,000,000us-gaap_CommonStockSharesAuthorized		500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value	$ 1.00us-gaap_CommonStockParOrStatedValuePerShare		$ 1.00us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares issued	194,754,812us-gaap_CommonStockSharesIssued		189,868,780us-gaap_CommonStockSharesIssued
Treasury stock, shares	538,921us-gaap_TreasuryStockShares		538,921us-gaap_TreasuryStockShares
MDU Resources Group, Inc. [Member]
Current assets:
Cash and cash equivalents	6,120us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		5,051us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		3,596us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		6,900us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Receivables, net	91,493us-gaap_ReceivablesNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		88,529us-gaap_ReceivablesNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accounts receivable from subsidiaries	32,691us-gaap_AccountsReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		31,372us-gaap_AccountsReceivableRelatedParties / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Inventories	33,584us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		29,312us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred income taxes	547us-gaap_DeferredTaxAssetsNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		3,196us-gaap_DeferredTaxAssetsNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Prepayments and other current assets	70,852us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		14,231us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total current assets	235,287us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		171,691us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investments	64,446us-gaap_LongTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		60,687us-gaap_LongTermInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in subsidiaries	2,590,283mdu_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		2,380,829mdu_InvestmentInSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Property, plant and equipment	1,984,956us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		1,785,861us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Less accumulated depreciation, depletion and amortization	660,026us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		660,693us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net property, plant and equipment	1,324,930us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		1,125,168us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred charges and other assets:
Goodwill	4,812us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		4,812us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other	163,408us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		121,253us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total deferred charges and other assets	168,220mdu_TotalDeferredChargesAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		126,065mdu_TotalDeferredChargesAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total assets	4,383,166us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		3,864,440us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Current liabilities:
Long-term debt due within one year	109us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		109us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accounts payable	48,088us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		45,282us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accounts payable to subsidiaries	30,863us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		4,839us-gaap_AccountsPayableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Taxes payable	10,583us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		12,337us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends payable	35,607us-gaap_DividendsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		33,737us-gaap_DividendsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accrued compensation	11,227us-gaap_AccruedSalariesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		16,076us-gaap_AccruedSalariesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other accrued liabilities	36,488us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		28,042us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total current liabilities	172,965us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		140,422us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Long-term debt	508,164us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		434,598us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Deferred credits and other liabilities:
Deferred income taxes	251,067us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		205,639us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other liabilities	316,929us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		260,617us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total deferred credits and other liabilities	567,996us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		466,256us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity:
Preferred stocks	15,000us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		15,000us-gaap_PreferredStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Authorized - 500,000,000 shares, $1.00 par value
Issued - 194,754,812 shares in 2014 and 189,868,780 shares in 2013	194,755us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		189,869us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other paid-in capital	1,207,188us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		1,056,996us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Retained earnings	1,762,827us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		1,603,130us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accumulated other comprehensive loss	(42,103)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		(38,205)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Treasury stock at cost - 538,921 shares	(3,626)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		(3,626)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total common stockholders' equity	3,119,041mdu_Commonequitystockholders / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		2,808,164mdu_Commonequitystockholders / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total stockholders' equity	3,134,041us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		2,823,164us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and equity	$ 4,383,166us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		$ 3,864,440us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Condensed Balance Sheet (Parenthetical)
Common stock, shares authorized	500,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		500,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, par value	$ 1.00us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		$ 1.00us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, shares issued	194,754,812us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		189,868,780us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Treasury stock, shares	538,921us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember		538,921us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
[1] Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.

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