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Property, Plant And Equipment - Schedule of Major Classifications of Property, Plant And Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Public Utility, Property, Plant and Equipment [Line Items] |  |
Construction work-in-progress (CWIP) and other | $ 179,527 | $ 164,147
Total | 7,979,008 | 7,725,835
Other Property | 393,985 | 365,085
Total | 7,985,433 | 7,742,466
Avista Utilities [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Total | 7,786,150 | 7,545,007
Common Plant | 759,498 | 744,173
Avista Utilities [Member] | Electricity [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Production | 1,498,398 | 1,593,795
Transmission | 1,059,389 | 994,709
Distribution | 2,383,201 | 2,236,376
Construction work-in-progress (CWIP) and other | 394,711 | 376,981
Total | 5,335,699 | 5,201,861
Avista Utilities [Member] | Natural Gas [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Distribution | 1,539,467 | 1,452,637
Construction work-in-progress (CWIP) and other | 91,492 | 88,264
Total | 1,690,953 | 1,598,973
Natural gas underground storage | 59,994 | 58,072
Alaska Electric Light & Power [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Total | 192,858 | 180,828
Common Plant | 10,340 | 10,018
Alaska Electric Light & Power [Member] | Electricity [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Production | 118,817 | 106,390
Transmission | 22,827 | 22,856
Distribution | 32,322 | 29,269
Construction work-in-progress (CWIP) and other | 8,552 | 12,295
Total | 182,518 | 170,810
Corporate and Other [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Other Property | $ 6,425 | $ 16,631

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