XML 86 R56.htm IDEA: XBRL DOCUMENT
v3.22.4

Accounting Policies - CECL Table (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Accounts Receivable, Credit Loss Expense (Reversal) | $ 6,133 | $ 1,085 | $ 10,576
Trade Accounts Receivable |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for doubtful accounts | 9,631 | 9,716 | 15,358
Accounts Receivable, Credit Loss Expense (Reversal) | 6,133 | 1,105 |
Accounts Receivable, Allowance for Credit Loss, Writeoff | 7,630 | 8,069 |
Accounts Receivable, Allowance for Credit Loss, Recovery | 1,412 | 1,322 |
Electric | Trade Accounts Receivable |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for doubtful accounts | 375 | 269 | 899
Accounts Receivable, Credit Loss Expense (Reversal) | 1,325 | 1,099 |
Accounts Receivable, Allowance for Credit Loss, Writeoff | 1,625 | 2,139 |
Accounts Receivable, Allowance for Credit Loss, Recovery | 406 | 410 |
Natural gas distribution | Trade Accounts Receivable |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for doubtful accounts | 1,615 | 1,506 | 2,571
Accounts Receivable, Credit Loss Expense (Reversal) | 4,084 | 2,188 |
Accounts Receivable, Allowance for Credit Loss, Writeoff | 4,913 | 4,072 |
Accounts Receivable, Allowance for Credit Loss, Recovery | 938 | 819 |
Pipeline | Trade Accounts Receivable |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for doubtful accounts | 2 | 2 | 2
Accounts Receivable, Credit Loss Expense (Reversal) | 0 | 0 |
Accounts Receivable, Allowance for Credit Loss, Writeoff | 0 | 0 |
Accounts Receivable, Allowance for Credit Loss, Recovery | 0 | 0 |
Construction materials and contracting | Trade Accounts Receivable |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for doubtful accounts | 5,477 | 5,406 | 6,164
Accounts Receivable, Credit Loss Expense (Reversal) | 538 | 68 |
Accounts Receivable, Allowance for Credit Loss, Writeoff | 467 | 826 |
Accounts Receivable, Allowance for Credit Loss, Recovery | 0 | 0 |
Construction services | Trade Accounts Receivable |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for doubtful accounts | 2,162 | 2,533 | $ 5,722
Accounts Receivable, Credit Loss Expense (Reversal) | 186 | (2,250) |
Accounts Receivable, Allowance for Credit Loss, Writeoff | 625 | 1,032 |
Accounts Receivable, Allowance for Credit Loss, Recovery | $ 68 | $ 93 |

X
- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
Name: | us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_TradeAccountsReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mdu_ElectricMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mdu_NaturalGasDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mdu_PipelineandMidstreamMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mdu_ConstructionMaterialsAndContractingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mdu_ConstructionServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |