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Multiemployer Plans Zones (Details 17)	12 Months Ended
	Dec. 31, 2022
Maximum
Multiemployer Plans [Line Items]
Multiemployer plan red zone status funded percentage	65.00%
Mulitiemployer plan yellow status funded percentage	80.00%
Minimum
Multiemployer Plans [Line Items]
Multiemployer plan yellow zone status funded percentage	65.00%
Multiemployer plan green zone status funded percentage	80.00%

X

- Definition

Mulitiemployer plan yellow status funded percentage

+ References

No definition available.

+ Details

Name:	mdu_Mulitiemployerplanyellowstatusfundedpercentage
Namespace Prefix:	mdu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Multiemployer plan green zone status funded percentage

+ References

No definition available.

+ Details

Name:	mdu_Multiemployerplangreenzonestatusfundedpercentage
Namespace Prefix:	mdu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Multiemployer plan red zone status funded percentage

+ References

No definition available.

+ Details

Name:	mdu_Multiemployerplanredzonestatusfundedpercentage
Namespace Prefix:	mdu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Multiemployer plan yellow zone status funded percentage

+ References

No definition available.

+ Details

Name:	mdu_Multiemployerplanyellowzonestatusfundedpercentage
Namespace Prefix:	mdu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_MultiemployerPlansLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: