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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Pay vs Performance Disclosure [Table]        
Pay vs Performance [Table Text Block]
Year1
Summary Compensation Table Total Compensation for Principal Executive Officer (PEO)2
($)
Compensation Actually Paid to PEO3
($)
Average Summary Compensation Table Total Compensation for Non-PEO Named Executive Officers4
($)
Average Compensation Actually Paid to Non-PEO Named Executive Officers5
($)
Value of initial fixed $100 investment based on:
Net Income8
(in thousands)
($)
Company Selected Measure - Earnings per Share9
($)
Total Stockholder Return6
($)
Peer Group Total Stockholder Return7
($)
20225,257,289 5,644,274 1,901,639 1,998,863 111.98 123.90 367,489 1.81 
20215,210,467 7,143,972 1,810,584 2,273,834 110.37 128.00 378,131 1.87 
20206,423,410 5,664,783 2,042,921 1,901,274 91.69 101.04 390,205 1.95 
      
Named Executive Officers, Footnote [Text Block] Our PEO for years 2020, 2021 and 2022 was David L. Goodin. Our non-PEO named executive officers (NEO) for 2020, 2021 and 2022 were Jason L. Vollmer, David C. Barney, Jeffrey S. Thiede and Nicole A. Kivisto.      
Peer Group Issuers, Footnote [Text Block] Represents the value of $100 invested in the compensation peer group company stock on December 31, 2019 as of December 31.2020,
December 31, 2021 and December 31, 2022 assuming dividends are reinvested in the compensation peer group stock at the frequency paid. Returns of each peer group company are weighted according to the peer group company’s market capitalization at the beginning of the period. Our compensation benchmarking peer group companies for 2020, 2021 and 2022 included:
202020212022
Alliant EnergyAlliant EnergyAlliant Energy
Ameren CorporationAmeren CorporationAmeren Corporation
Atmos Energy CorporationAtmos Energy CorporationAtmos Energy Corporation
Black Hills CorporationBlack Hills CorporationBlack Hills Corporation
CMS Energy CorporationCMS Energy CorporationCMS Energy Corporation
Dycom Industries, Inc.Dycom Industries, Inc.Dycom Industries, Inc.
EMCOR Group, Inc.EMCOR Group, Inc.EMCOR Group, Inc.
Evergy, Inc.Evergy, Inc.Evergy, Inc.
Granite Construction IncorporatedGranite Construction IncorporatedGranite Construction Incorporated
Jacobs Engineering Group Inc.Jacobs Engineering Group Inc.*KRB, Inc.
KRB, Inc.KRB, Inc.Martin Marietta Materials, Inc.
Martin Marietta Materials, Inc.Martin Marietta Materials, Inc.MasTec, Inc.
MasTec, Inc.MasTec, Inc.MYR Group, Inc.*
NiSource Inc.NiSource Inc.NiSource Inc.
Pinnacle West Capital CorporationPinnacle West Capital CorporationPinnacle West Capital Corporation
Portland General Electric CompanyPortland General Electric CompanyPortland General Electric Company
Quanta Services, Inc.Quanta Services, Inc.Quanta Services, Inc.
Southwest Gas Holdings, Inc.Southwest Gas Holdings, Inc.Southwest Gas Holdings, Inc.
Summit Materials, Inc.Summit Materials, Inc.Summit Materials, Inc.
Vulcan Materials CompanyVulcan Materials CompanyVulcan Materials Company
WEC Energy Group, Inc.WEC Energy Group, Inc.WEC Energy Group, Inc.
*Jacobs Engineering Group, Inc. was replaced with MYR Group Inc. in 2022 due to size. Total stockholder return for the peer group companies for 12/31/2020, 12/31/2021 and 12/31/2022 were as follows
12/31/201912/31/202012/31/202112/31/2022
Peer group with Jacobs Engineering Group Inc.$100.00 $101.04 $128.00 $124.22 
Peer group with MYR Group, Inc.$100.00 $100.01 $126.85 $123.90 
      
PEO Total Compensation Amount $ 5,257,289 $ 5,210,467 $ 6,423,410  
PEO Actually Paid Compensation Amount 5,644,274 7,143,972 5,664,783  
Non-PEO NEO Average Total Compensation Amount 1,901,639 1,810,584 2,042,921  
Non-PEO NEO Average Compensation Actually Paid Amount $ 1,998,863 2,273,834 1,901,274  
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
CAP vs. TSR
Our TSR is a reflection of our stock price and dividends paid over a period of time and is important to stockholders as it measures the performance of an investment in our company stock in the marketplace. The following charts depicts the PEO and average non-PEO named executive officer CAP compared to the value of $100 invested in company and peer company stock on December 31, 2019 as of December 31, 2020, December 31, 2021 and December 31, 2022 assuming dividends are reinvested in company stock at the frequency paid.
mdu-20230323_g47.jpg
      
Compensation Actually Paid vs. Net Income [Text Block]
CAP vs. Net Income
The following charts depicts the PEO and average non-PEO NEO CAP compared to the company’s net income for 2020, 2021 and 2022.
mdu-20230323_g48.jpg
CAP vs. EPS
The following charts depicts the PEO and average non-PEO named executive officer CAP compared to the company’s EPS for 2020, 2021 and 2022.
      
Compensation Actually Paid vs. Company Selected Measure [Text Block] mdu-20230323_g49.jpg      
Total Shareholder Return Amount $ 111.98 110.37 91.69  
Net Income (Loss) $ 367,489,000 $ 378,131,000 $ 390,205,000  
Company Selected Measure Amount | $ / shares 1.81 1.87 1.95  
PEO Name David L. Goodin      
Measure [Axis]: 1        
Pay vs Performance Disclosure [Table]        
Measure Name Earnings per Share      
Measure [Axis]: 2        
Pay vs Performance Disclosure [Table]        
Measure Name Earnings Growth from Continuing Operations      
Measure [Axis]: 3        
Pay vs Performance Disclosure [Table]        
Measure Name Relative Total Stockholder Return      
MYR Group, Inc. [Member]        
Pay vs Performance Disclosure [Table]        
Peer Group Total Shareholder Return Amount $ 123.90 $ 126.85 $ 100.01 $ 100.00
Jacobs Engineering Group Inc. [Member]        
Pay vs Performance Disclosure [Table]        
Peer Group Total Shareholder Return Amount 124.22 128.00 101.04 $ 100.00
PEO [Member] | Equity Award Values Reported in the SCT [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 3,247,775 3,222,639 2,974,497  
PEO [Member] | Equity Award Adjustments [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 3,634,760 5,156,144 2,651,451  
PEO [Member] | Changes to Pension Reported in SCT [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 435,581  
PEO [Member] | Aggregated Service Cost and Prior Service Cost [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0  
PEO [Member] | YE Value of Equity Awards Granted during year which are Unvested [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 3,665,234 3,586,652 2,402,446  
PEO [Member] | Y o Y Change in Value of Equity Awards Granted in Prior Years which are Unvested [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (198,017) (90,005) (557,760)  
PEO [Member] | Value at Vesting Date of Equity Awards Granted and Vesting in the Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0  
PEO [Member] | Y o Y Change in Value of Equity Awards Granted in prior years which Vest in Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 167,543 1,659,497 806,765  
PEO [Member] | PYE Value of Equity Awards that Failed to Meet Vesting Conditions [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0   0  
PEO [Member] | Value of Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Value or Total Compensation [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0  
Non-PEO NEO [Member] | Equity Award Values Reported in the SCT [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 862,681 870,757 707,370  
Non-PEO NEO [Member] | Equity Award Adjustments [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 959,905 1,334,007 634,637  
Non-PEO NEO [Member] | Changes to Pension Reported in SCT [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 68,914  
Non-PEO NEO [Member] | Aggregated Service Cost and Prior Service Cost [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0  
Non-PEO NEO [Member] | YE Value of Equity Awards Granted during year which are Unvested [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 973,569 969,113 571,330  
Non-PEO NEO [Member] | Y o Y Change in Value of Equity Awards Granted in Prior Years which are Unvested [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount (53,505) (21,403) (129,852)  
Non-PEO NEO [Member] | Value at Vesting Date of Equity Awards Granted and Vesting in the Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0  
Non-PEO NEO [Member] | Y o Y Change in Value of Equity Awards Granted in prior years which Vest in Year [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 39,841 386,297 193,159  
Non-PEO NEO [Member] | PYE Value of Equity Awards that Failed to Meet Vesting Conditions [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount 0 0 0  
Non-PEO NEO [Member] | Value of Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Value or Total Compensation [Member]        
Pay vs Performance Disclosure [Table]        
Adjustment to Compensation Amount $ 0 $ 0 $ 0