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Leases - Lease Revenue - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Lessor, Lease, Description [Line Items]          
Lessor, Sales-type Lease, Renewal Term 50 years   50 years    
Lessor, Sales-type Lease, Term of Contract 30 years   30 years    
Residual Value of Leased Asset $ 5,400 $ 5,000 $ 5,400 $ 5,000 $ 5,100
Lease Revenue [Abstract]          
Total lease revenue 100 300 500 400  
Operating Leases Payment to be Received [Abstract]          
Operating Lease, Payments to be Received, Remainder of Fiscal Year 166   166    
Lessor, Operating Lease, Payment to be Received, Year One 655   655    
Operating Lease, Payments to be Received, Two Years 652   652    
Operating Lease, Payments to be Received, Three Years 92   92    
Operating Lease, Payments to be Received, Four Years 79   79    
Operating Lease, Payments to be Received, Thereafter 857   857    
Total minimum lease payments 2,501   2,501    
Total Lease Payments to be Received [Abstract]          
Lease Payments to be Received, Remainder of Fiscal Year 4,266   4,266    
Lease Payments to be Received, Two Years 16,522   16,522    
Lease Payments to be Received, Three Years 15,958   15,958    
Lease Payments to be Received, Four Years 14,993   14,993    
Lease Payments to be Received, Five Years 14,600   14,600    
Lease Payments to be Received, Thereafter 223,156   223,156    
Total minimum lease payments 289,495   289,495    
Northwest Natural Gas Company [Member]          
Lease Revenue [Abstract]          
Operating leases 19 19 57 56  
Sales-type leases 4,001 4,279 11,973 12,839  
Total lease revenue 4,020 $ 4,298 12,030 $ 12,895  
Operating Leases Payment to be Received [Abstract]          
Operating Lease, Payments to be Received, Remainder of Fiscal Year 153   153    
Lessor, Operating Lease, Payment to be Received, Year One 603   603    
Operating Lease, Payments to be Received, Two Years 599   599    
Operating Lease, Payments to be Received, Three Years 36   36    
Operating Lease, Payments to be Received, Four Years 22   22    
Operating Lease, Payments to be Received, Thereafter 0   0    
Total minimum lease payments 1,413   1,413    
Total Lease Payments to be Received [Abstract]          
Lease Payments to be Received, Remainder of Fiscal Year 4,253   4,253    
Lease Payments to be Received, Two Years 16,470   16,470    
Lease Payments to be Received, Three Years 15,905   15,905    
Lease Payments to be Received, Four Years 14,937   14,937    
Lease Payments to be Received, Five Years 14,543   14,543    
Lease Payments to be Received, Thereafter 222,299   222,299    
Total minimum lease payments 288,407   288,407    
Other Northwest Holdings [Member]          
Operating Leases Payment to be Received [Abstract]          
Operating Lease, Payments to be Received, Remainder of Fiscal Year 13   13    
Lessor, Operating Lease, Payment to be Received, Year One 52   52    
Operating Lease, Payments to be Received, Two Years 53   53    
Operating Lease, Payments to be Received, Three Years 56   56    
Operating Lease, Payments to be Received, Four Years 57   57    
Operating Lease, Payments to be Received, Thereafter 857   857    
Total minimum lease payments 1,088   1,088    
Total Lease Payments to be Received [Abstract]          
Lease Payments to be Received, Remainder of Fiscal Year 13   13    
Lease Payments to be Received, Two Years 52   52    
Lease Payments to be Received, Three Years 53   53    
Lease Payments to be Received, Four Years 56   56    
Lease Payments to be Received, Five Years 57   57    
Lease Payments to be Received, Thereafter 857   857    
Total minimum lease payments $ 1,088   $ 1,088    
Compressed Natural Gas Lease [Member]          
Lessor, Lease, Description [Line Items]          
Lessor, Sales-type Lease, Term of Contract 10 years   10 years    
Residual Value of Leased Asset $ 0   $ 0    
Variable Lease, Payment     0    
North Mist Lease [Member]          
Lessor, Lease, Description [Line Items]          
Residual Value of Leased Asset 0   0    
Variable Lease, Payment     0    
Sales-type Lease [Member]          
Sales-type Leases Payments to be Received [Abstract]          
Sales-type Lease, Payments to be Received, Remainder of Fiscal Year 4,100   4,100    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 15,867   15,867    
Sales-type Lease, Payments to be Received, Two Years 15,306   15,306    
Sales-type Lease, Payments to be Received, Three Years 14,901   14,901    
Sales-type Lease, Payments to be Received, Four Years 14,521   14,521    
Sales-type Lease, Payments to be Received, Thereafter 222,299   222,299    
Total minimum lease payments 286,994   286,994    
Less: imputed interest 156,626   156,626    
Total leases receivable 130,368   130,368    
Sales-type Lease [Member] | Northwest Natural Gas Company [Member]          
Sales-type Leases Payments to be Received [Abstract]          
Sales-type Lease, Payments to be Received, Remainder of Fiscal Year 4,100   4,100    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 15,867   15,867    
Sales-type Lease, Payments to be Received, Two Years 15,306   15,306    
Sales-type Lease, Payments to be Received, Three Years 14,901   14,901    
Sales-type Lease, Payments to be Received, Four Years 14,521   14,521    
Sales-type Lease, Payments to be Received, Thereafter 222,299   222,299    
Total minimum lease payments 286,994   286,994    
Less: imputed interest 156,626   156,626    
Total leases receivable 130,368   130,368    
Sales-type Lease [Member] | Other Northwest Holdings [Member]          
Sales-type Leases Payments to be Received [Abstract]          
Sales-type Lease, Payments to be Received, Remainder of Fiscal Year 0   0    
Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One 0   0    
Sales-type Lease, Payments to be Received, Two Years 0   0    
Sales-type Lease, Payments to be Received, Three Years 0   0    
Sales-type Lease, Payments to be Received, Four Years 0   0    
Sales-type Lease, Payments to be Received, Thereafter 0   0    
Total minimum lease payments $ 0   $ 0