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Debt and Financing Arrangements - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 25, 2018 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Line of Credit Facility [Line Items] |  |  |  |  |  |
Weighted average interest rate on short term borrowings |  | 2.10% | 1.20% | 1.70% | 1.30% | 1.20%
Capital lease obligation, current |  | $ 100,000 |  | $ 100,000 |  |
Capital lease obligation, noncurrent |  | 100,000 |  | 100,000 |  |
Accounts Payable |  | 34,300,000 | $ 32,600,000 | 34,300,000 | $ 32,600,000 | $ 52,400,000
Total rental expense under operating leases |  | 500,000 | 500,000 | 900,000 | 1,000,000 |
Net Utility Plant |  | 1,279,100,000 | $ 1,209,800,000 | 1,279,100,000 | 1,209,800,000 | 1,257,200,000
Guarantee outstanding |  | 700,000 |  | 700,000 |  |
Operating lease obligations |  |  |  | 900,000 | $ 1,000,000 |
Other current operating lease obligation |  | 1,500,000 |  | 1,500,000 |  |
Other noncurrent operating lease obligation |  | $ 2,900,000 |  | $ 2,900,000 |  |
Operating lease, weighted average remaining lease term |  | 3 years 3 months 18 days | 3 years 7 months 6 days | 3 years 3 months 18 days | 3 years 7 months 6 days |
Operating lease, weighted average discount rate percentage |  | 3.60% | 4.20% | 3.60% | 4.20% |
Guarantee Term Period |  |  |  | 1 year |  |
Assets under Capital Leases [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Net Utility Plant |  | $ 700,000 | $ 900,000 | $ 700,000 | $ 900,000 | 700,000
Net Utility Plant, accumulated amortization |  | $ 400,000 | 500,000 | $ 400,000 | 500,000 | 300,000
Northern Utilities Inc |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Total funded indebtedness as percentage of capitalization |  | 65.00% |  | 65.00% |  |
Natural gas storage inventory |  | $ 12,600,000 | 4,900,000 | $ 12,600,000 | 4,900,000 | 8,300,000
Accounts Payable |  | 200,000 | 100,000 | 200,000 | 100,000 | 1,600,000
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Revolving credit facility |  | $ 120,000,000 | $ 120,000,000 | 120,000,000 | $ 120,000,000 | $ 120,000,000
Proceeds from lines of credit |  |  |  | 151,900,000 |  |
Repayments of lines of credit |  |  |  | $ 169,800,000 |  |
Credit Facility | Second Amended Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Revolving credit facility | $ 120,000,000 |  |  |  |  |
Sublimit for the issuance of standby letters of credit | $ 25,000,000 |  |  |  |  |
Credit Facility | Second Amended Credit Facility | London Interbank Offered Rate |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Credit facility, daily fluctuating rate of interest | 1.125% |  |  |  |  |

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