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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 298,255 | $ 278,592 | $ 711,125 | $ 668,822
Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 88,939 | 82,950 | 208,210 | 196,782
Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 87,035 | 74,514 | 169,990 | 159,572
Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 27,429 | 24,816 | 52,140 | 49,527
Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,928 | 1,905 | 3,840 | 3,750
Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 205,331 | 184,185 | 434,180 | 409,631
Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 4,801 | 4,409 | 8,296 | 8,183
Other Electric Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 6,532 | 3,415 | 12,672 | 8,705
Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 216,664 | 192,009 | 455,148 | 426,519
Avista Utilities [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 287,560 | 268,339 | 687,420 | 645,544
Avista Utilities [Member] | Revenue from Contracts with Customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 260,676 | 235,405 | 619,289 | 587,034
Avista Utilities [Member] | Derivative revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,083 | 24,211 | 63,064 | 55,285
Avista Utilities [Member] | Alternative Revenue Programs [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,069 | 4,362 | 2,570 | (51)
Avista Utilities [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 369 | 2,080 | 2,820 | (525)
Avista Utilities [Member] | Other Utility Revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,239 | 2,281 | 4,817 | 3,801
Alaska Electric Light & Power [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,547 | 9,998 | 23,368 | 22,200
Alaska Electric Light & Power [Member] | Revenue from Contracts with Customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 10,487 | 9,978 | 23,266 | 22,104
Alaska Electric Light & Power [Member] | Deferrals and Amortizations for Rate Refunds to Customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 48 | (47) | 95 | (95)
Alaska Electric Light & Power [Member] | Other Utility Revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 108 | 67 | 197 | 191
Corporate and Other [Member] | Other Revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 148 | 255 | 337 | 1,078
Avista Utilities [Member] | Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 84,688 | 78,760 | 197,911 | 186,737
Avista Utilities [Member] | Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 80,858 | 68,785 | 157,142 | 147,634
Avista Utilities [Member] | Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 27,429 | 24,816 | 52,140 | 49,527
Avista Utilities [Member] | Public Street and Highway Lighting Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,869 | 1,846 | 3,721 | 3,629
Avista Utilities [Member] | Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 194,844 | 174,207 | 410,914 | 387,527
Avista Utilities [Member] | Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 4,801 | 4,409 | 8,296 | 8,183
Avista Utilities [Member] | Other Electric Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 6,532 | 3,415 | 12,672 | 8,705
Avista Utilities [Member] | Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 206,177 | 182,031 | 431,882 | 404,415
Avista Utilities [Member] | Residential Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 33,703 | 34,826 | 121,204 | 118,998
Avista Utilities [Member] | Commercial Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 15,598 | 14,142 | 55,373 | 53,544
Avista Utilities [Member] | Industrial and Interruptible Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,819 | 1,543 | 4,043 | 3,737
Avista Utilities [Member] | Retail Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 51,120 | 50,511 | 180,620 | 176,279
Avista Utilities [Member] | Transportation Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 1,973 | 1,738 | 4,256 | 4,090
Avista Utilities [Member] | Natural Gas [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 54,499 | 53,374 | 187,407 | 182,619
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 | 2,531 | 2,250
Alaska Electric Light & Power [Member] | Residential Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 4,251 | 4,190 | 10,299 | 10,045
Alaska Electric Light & Power [Member] | Commercial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 6,177 | 5,729 | 12,848 | 11,938
Alaska Electric Light & Power [Member] | Industrial Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 0 | 0 | 0 | 0
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 | 121
Alaska Electric Light & Power [Member] | Retail Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 10,487 | 9,978 | 23,266 | 22,104
Alaska Electric Light & Power [Member] | Transmission Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 0 | 0 | 0 | 0
Alaska Electric Light & Power [Member] | Other Electric Revenues from Contracts With Customers [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | 0 | 0 | 0 | 0
Alaska Electric Light & Power [Member] | Electric [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from contract with customer including assessed tax | $ 10,487 | $ 9,978 | $ 23,266 | $ 22,104

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