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Income tax expense (benefit) statutory rate versus actual rate (Details 5) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Computed tax at federal statutory rate |  |  |
Computed tax at federal statutory rate | $ 143,895,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 145,466,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (15,914,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Federal statutory rate (in hundredths) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increases (reductions) resulting from: |  |  |
State income taxes, net of federal income tax | 10,483,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 10,524,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 2,469,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State income tax rate (in hundredths) | 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | (5.40%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Domestic production activities | (5,460,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (677,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | 0 us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Domestic production activities (in hundredths) | (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities | (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Nonqualified benefit plans | (1,624,000)mdu_IncomeTaxReconciliationNonqualifiedBenefitPlans | (5,173,000)mdu_IncomeTaxReconciliationNonqualifiedBenefitPlans | (2,359,000)mdu_IncomeTaxReconciliationNonqualifiedBenefitPlans
Nonqualified benefit plans (in hundredths) | (0.40%)mdu_EffectiveIncomeTaxRateReconciliationNonqualifiedBenefitPlans | (1.20%)mdu_EffectiveIncomeTaxRateReconciliationNonqualifiedBenefitPlans | 5.20%mdu_EffectiveIncomeTaxRateReconciliationNonqualifiedBenefitPlans
Depletion allowance | (4,010,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion | (3,764,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion | (3,728,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepletion
Depletion allowance rate (in hundredths) | (1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion | (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion | 8.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepletion
Federal renewable energy credit | (3,655,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther | (3,404,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther | (3,401,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther
Federal renewable energy credit rate (in hundreths) | (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther | (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther | 7.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Deductible K-Plan dividends | (2,062,000)us-gaap_IncomeTaxReconciliationDeductionsDividends | (1,593,000)us-gaap_IncomeTaxReconciliationDeductionsDividends | (2,829,000)us-gaap_IncomeTaxReconciliationDeductionsDividends
Deductible K-Plan dividends rate (in hundredths) | (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends | (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends | 6.20%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends
AFUDC equity | (2,031,000)mdu_AfudcEquity | (1,074,000)mdu_AfudcEquity | (1,500,000)mdu_AfudcEquity
AFUDC equity rate (in hundredths) | (0.50%)mdu_AfudcEquityRateInHundredths | (0.30%)mdu_AfudcEquityRateInHundredths | 3.30%mdu_AfudcEquityRateInHundredths
Resolution of tax matters and uncertain tax positions | (7,367,000)us-gaap_IncomeTaxReconciliationTaxSettlements | (859,000)us-gaap_IncomeTaxReconciliationTaxSettlements | 2,559,000 us-gaap_IncomeTaxReconciliationTaxSettlements
Resolution of tax matters and uncertain tax positions rate (in hundredths) | (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements | (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements | (5.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements
Deferred tax rate changes | 9,000 mdu_DeferredTaxRateChanges | 741,000 mdu_DeferredTaxRateChanges | (3,083,000)mdu_DeferredTaxRateChanges
Deferred tax rate changes rate (in hundredths) | 0.00%mdu_DeferredTaxRateChangesRateInHundredths | 0.20%mdu_DeferredTaxRateChangesRateInHundredths | 6.80%mdu_DeferredTaxRateChangesRateInHundredths
Other | (8,209,000)us-gaap_IncomeTaxReconciliationOtherAdjustments | (3,451,000)us-gaap_IncomeTaxReconciliationOtherAdjustments | (3,360,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Other rate (in hundredths) | (1.90%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 7.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total income tax expense (benefit) | 119,969,000 us-gaap_IncomeTaxExpenseBenefit | 136,736,000 us-gaap_IncomeTaxExpenseBenefit | (31,146,000)us-gaap_IncomeTaxExpenseBenefit
Total income tax expense (benefit) rate (in hundredths) | 29.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 32.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 68.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Temporary differences [Abstract] |  |  |
Undistributed earnings from foreign operations | 3,600,000 mdu_UndistributedEarningsFromForeignOperations |  |
Deferred tax liabilities, undistributed foreign earnings | $ 1,400,000 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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