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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 462,046 | $ 412,870
Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 127,464 | 119,271
Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 90,004 | 81,056
Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 24,892 | 26,610
Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 1,924 | 1,912
Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 244,284 | 228,849
Transmission Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 4,685 | 3,495
Other Electric Revenues from Contracts With Customers [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 8,762 | 6,140
Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 257,731 | 238,484
Avista Utilities [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 448,872 | 399,860
Avista Utilities [Member] | Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 121,003 | 113,223
Avista Utilities [Member] | Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 83,570 | 76,284
Avista Utilities [Member] | Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 24,892 | 24,711
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 1,864 | 1,852
Avista Utilities [Member] | Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 231,329 | 216,070
Avista Utilities [Member] | Transmission Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 4,685 | 3,495
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 8,762 | 6,140
Avista Utilities [Member] | Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 244,776 | 225,705
Avista Utilities [Member] | Residential Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 103,215 | 87,501
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 50,621 | 39,775
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 2,962 | 2,224
Avista Utilities [Member] | Retail Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 156,798 | 129,500
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 2,357 | 2,283
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 | 1,125
Avista Utilities [Member] | Natural Gas [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 160,561 | 132,908
Avista Utilities [Member] | Revenue from Contracts with Customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 405,337 | 358,613
Avista Utilities [Member] | Derivative revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 57,373 | 34,981
Avista Utilities [Member] | Alternative Revenue Programs [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (16,777) | 499
Avista Utilities [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 369 | 3,189
Avista Utilities [Member] | Other Utility Revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,570 | 2,578
Alaska Electric Light & Power [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 13,054 | 12,821
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 6,461 | 6,048
Alaska Electric Light & Power [Member] | Commercial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 6,434 | 4,772
Alaska Electric Light & Power [Member] | Industrial Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax |  | 1,899
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 | 60 | 60
Alaska Electric Light & Power [Member] | Retail Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 12,955 | 12,779
Alaska Electric Light & Power [Member] | Electric [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer including assessed tax | 12,955 | 12,779
Alaska Electric Light & Power [Member] | Revenue from Contracts with Customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 12,955 | 12,779
Alaska Electric Light & Power [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (48) | (47)
Alaska Electric Light & Power [Member] | Other Utility Revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 147 | 89
Corporate and Other [Member] | Other Non-utility Revenues |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 120 | $ 189

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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