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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 378,566 | $ 298,255 | $ 840,612 | $ 711,125
Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 88,264 | 88,939 | 215,728 | 208,210
Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 86,764 | 87,035 | 176,768 | 169,990
Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 27,253 | 27,429 | 52,145 | 52,140
Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,971 | 1,928 | 3,895 | 3,840
Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 204,252 | 205,331 | 448,536 | 434,180
Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 8,417 | 4,801 | 13,102 | 8,296
Other Electric Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 7,409 | 6,532 | 16,171 | 12,672
Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 220,078 | 216,664 | 477,809 | 455,148
Avista Utilities [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 368,515 | 287,560 | 817,387 | 687,420
Avista Utilities [Member] | Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 84,108 | 84,688 | 205,111 | 197,911
Avista Utilities [Member] | Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 80,713 | 80,858 | 164,283 | 157,142
Avista Utilities [Member] | Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 27,253 | 27,429 | 52,145 | 52,140
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,912 | 1,869 | 3,776 | 3,721
Avista Utilities [Member] | Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 193,986 | 194,844 | 425,315 | 410,914
Avista Utilities [Member] | Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 8,417 | 4,801 | 13,102 | 8,296
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 7,409 | 6,532 | 16,171 | 12,672
Avista Utilities [Member] | Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 209,812 | 206,177 | 454,588 | 431,882
Avista Utilities [Member] | Residential Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 48,480 | 33,703 | 151,695 | 121,204
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 23,736 | 15,598 | 74,357 | 55,373
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 2,346 | 1,819 | 5,308 | 4,043
Avista Utilities [Member] | Retail Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 74,562 | 51,120 | 231,360 | 180,620
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 2,142 | 1,973 | 4,499 | 4,256
Avista Utilities [Member] | Other Natural Gas Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,406 | 1,406 | 2,812 | 2,531
Avista Utilities [Member] | Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 78,110 | 54,499 | 238,671 | 187,407
Avista Utilities [Member] | Revenue from Contracts with Customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 287,922 | 260,676 | 693,259 | 619,289
Avista Utilities [Member] | Derivative revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 84,403 | 28,083 | 141,776 | 63,064
Avista Utilities [Member] | Alternative Revenue Programs [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (5,793) | (3,069) | (22,570) | (2,570)
Avista Utilities [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (500) | (369) | (131) | 2,820
Avista Utilities [Member] | Other Utility Revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,483 | 2,239 | 5,053 | 4,817
Alaska Electric Light & Power [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,906 | 10,547 | 22,960 | 23,368
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 4,156 | 4,251 | 10,617 | 10,299
Alaska Electric Light & Power [Member] | Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 6,051 | 6,177 | 12,485 | 12,848
Alaska Electric Light & Power [Member] | Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 59 | 59 | 119 | 119
Alaska Electric Light & Power [Member] | Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 10,266 | 10,487 | 23,221 | 23,266
Alaska Electric Light & Power [Member] | Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 10,266 | 10,487 | 23,221 | 23,266
Alaska Electric Light & Power [Member] | Revenue from Contracts with Customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,266 | 10,487 | 23,221 | 23,266
Alaska Electric Light & Power [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (517) | (48) | (565) | (95)
Alaska Electric Light & Power [Member] | Other Utility Revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 157 | 108 | 304 | 197
Corporate and Other [Member] | Other Non-utility Revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 145 | $ 148 | $ 265 | $ 337

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