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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 124,993 $ 117,578 $ 405,998 $ 420,071
Revenues 134,971 123,443 420,122 408,791
Operating leases 25 47 53 95
Natural Gas Sales [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 116,682 112,015 390,686 408,201
Gas Storage Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,449 2,740 4,785 5,523
Asset Management Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 910 460 1,060 1,966
Appliance Center Revenue [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 806 1,058 2,362 2,574
Other revenue [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 4,146 1,305 7,105 1,807
Alternative revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 5,365 3,733 4,893 (13,520)
Leasing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating leases 4,613 2,132 9,231 2,240
Northwest Natural Gas Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 131,157 122,242 413,686 407,088
Northwest Natural Gas Company [Member] | Northwest Natural Gas Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 121,179 116,377 399,562 418,368
Revenues 131,157 122,242 413,686 407,088
Northwest Natural Gas Company [Member] | Northwest Natural Gas Company [Member] | Natural Gas Sales [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 116,682 112,015 390,686 408,201
Northwest Natural Gas Company [Member] | Northwest Natural Gas Company [Member] | Gas Storage Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,449 2,740 4,785 5,523
Northwest Natural Gas Company [Member] | Northwest Natural Gas Company [Member] | Asset Management Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 910 460 1,060 1,966
Northwest Natural Gas Company [Member] | Northwest Natural Gas Company [Member] | Appliance Center Revenue [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 806 1,058 2,362 2,574
Northwest Natural Gas Company [Member] | Northwest Natural Gas Company [Member] | Other revenue [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 332 104 669 104
Northwest Natural Gas Company [Member] | Northwest Natural Gas Company [Member] | Alternative revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 5,365 3,733 4,893 (13,520)
Northwest Natural Gas Company [Member] | Northwest Natural Gas Company [Member] | Leasing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating leases 4,613 2,132 9,231 2,240
Operating Segments [Member] | Natural Gas Distribution [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 126,992 117,984 405,479 397,025
Operating Segments [Member] | Natural Gas Distribution [Member] | Northwest Natural Gas Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 117,014 112,119 391,355 408,305
Revenues 126,992 117,984 405,479 397,025
Operating Segments [Member] | Natural Gas Distribution [Member] | Northwest Natural Gas Company [Member] | Natural Gas Sales [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 116,682 112,015 390,686 408,201
Operating Segments [Member] | Natural Gas Distribution [Member] | Northwest Natural Gas Company [Member] | Gas Storage Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Operating Segments [Member] | Natural Gas Distribution [Member] | Northwest Natural Gas Company [Member] | Asset Management Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Operating Segments [Member] | Natural Gas Distribution [Member] | Northwest Natural Gas Company [Member] | Appliance Center Revenue [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Operating Segments [Member] | Natural Gas Distribution [Member] | Northwest Natural Gas Company [Member] | Other revenue [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 332 104 669 104
Operating Segments [Member] | Natural Gas Distribution [Member] | Northwest Natural Gas Company [Member] | Alternative revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 5,365 3,733 4,893 (13,520)
Operating Segments [Member] | Natural Gas Distribution [Member] | Northwest Natural Gas Company [Member] | Leasing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating leases 4,613 2,132 9,231 2,240
Operating Segments [Member] | Northwest Natural Gas Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 131,157 122,242 413,686 407,088
Corporate, Non-Segment [Member] | Other Northwest Natural [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 4,165 4,258 8,207 10,063
Corporate, Non-Segment [Member] | Other Northwest Natural [Member] | Northwest Natural Gas Company [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4,165 4,258 8,207 10,063
Revenues 4,165 4,258 8,207 10,063
Corporate, Non-Segment [Member] | Other Northwest Natural [Member] | Northwest Natural Gas Company [Member] | Natural Gas Sales [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Natural [Member] | Northwest Natural Gas Company [Member] | Gas Storage Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,449 2,740 4,785 5,523
Corporate, Non-Segment [Member] | Other Northwest Natural [Member] | Northwest Natural Gas Company [Member] | Asset Management Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 910 460 1,060 1,966
Corporate, Non-Segment [Member] | Other Northwest Natural [Member] | Northwest Natural Gas Company [Member] | Appliance Center Revenue [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 806 1,058 2,362 2,574
Corporate, Non-Segment [Member] | Other Northwest Natural [Member] | Northwest Natural Gas Company [Member] | Other revenue [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Natural [Member] | Northwest Natural Gas Company [Member] | Alternative revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Natural [Member] | Northwest Natural Gas Company [Member] | Leasing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating leases 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Holdings [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,814 1,201 6,436 1,703
Revenues 3,814 1,201 6,436 1,703
Corporate, Non-Segment [Member] | Other Northwest Holdings [Member] | Natural Gas Sales [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Holdings [Member] | Gas Storage Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Holdings [Member] | Asset Management Revenue, Net of Regulatory Sharing [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Holdings [Member] | Appliance Center Revenue [Member] | Transferred at Point in Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Holdings [Member] | Other revenue [Member] | Transferred over Time [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,814 1,201 6,436 1,703
Corporate, Non-Segment [Member] | Other Northwest Holdings [Member] | Alternative revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Corporate, Non-Segment [Member] | Other Northwest Holdings [Member] | Leasing revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating leases $ 0 $ 0 $ 0 $ 0