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Information By Business Segments (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Reportable_Segments
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]                      
Number of Reportable Segments | Reportable_Segments                 2    
Operating revenues $ 397,862 $ 297,096 $ 314,501 $ 436,470 $ 402,123 $ 303,349 $ 318,838 $ 418,173 $ 1,445,929 $ 1,442,483 $ 1,484,776
Resource costs                 524,566 551,366 656,964
Other operating expenses                 358,081 341,296 332,747
Depreciation and amortization                 172,021 161,283 144,194
Income from operations 81,984 $ 31,042 $ 56,097 $ 115,386 82,533 $ 39,594 $ 61,591 $ 106,085 284,509 289,803 253,214
Interest expense                 96,192 87,130 80,441
Total income tax expense                 82,758 78,086 67,449
Payments to Acquire Other Property, Plant, and Equipment                 416,619 406,997 394,310
Total assets 5,514,732       5,309,755       5,514,732 5,309,755 4,906,649
Income (Loss) from Continuing Operations Attributable to Parent                 115,916 137,228 118,080
Acquisition costs                 14,618 0 0
Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenues                 1,423,386 1,418,914 1,456,641
Resource costs                 524,566 551,366 656,964
Other operating expenses                 332,431 315,795 303,221
Depreciation and amortization                 171,281 160,514 143,499
Income from operations                 288,356 292,504 255,300
Interest expense                 95,600 86,654 79,963
Total income tax expense                 83,098 79,442 68,691
Payments to Acquire Other Property, Plant, and Equipment                 412,339 406,644 393,425
Total assets 5,456,566       5,249,325       5,456,566 5,249,325 4,867,443
Income (Loss) from Continuing Operations Attributable to Parent                 123,770 140,458 120,001
Operating Segments [Member] | Avista Utilities [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenues                 1,370,359 1,372,638 1,411,863
Resource costs                 511,163 539,352 644,991
Other operating expenses                 319,899 304,644 292,096
Depreciation and amortization                 165,478 155,162 138,236
Income from operations                 270,409 277,070 241,228
Interest expense                 92,019 83,070 76,405
Total income tax expense                 77,583 74,121 64,489
Payments to Acquire Other Property, Plant, and Equipment                 405,938 390,690 381,174
Total assets 5,177,878       4,975,555       5,177,878 4,975,555 4,601,708
Income (Loss) from Continuing Operations Attributable to Parent                 114,716 132,490 113,360
Operating Segments [Member] | Alaska Electric Light & Power [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenues                 53,027 46,276 44,778
Resource costs                 13,403 12,014 11,973
Other operating expenses                 12,532 11,151 11,125
Depreciation and amortization                 5,803 5,352 5,263
Income from operations                 17,947 15,434 14,072
Interest expense                 3,581 3,584 3,558
Total income tax expense                 5,515 5,321 4,202
Payments to Acquire Other Property, Plant, and Equipment                 6,401 15,954 12,251
Total assets 278,688       273,770       278,688 273,770 265,735
Income (Loss) from Continuing Operations Attributable to Parent                 9,054 7,968 6,641
Operating Segments [Member] | Corporate and Other [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenues                 22,543 23,569 28,685
Resource costs                 0 0 0
Other operating expenses                 25,650 25,501 30,076
Depreciation and amortization                 740 769 695
Income from operations                 (3,847) (2,701) (2,086)
Interest expense                 781 608 610
Total income tax expense                 (340) (1,356) (1,242)
Payments to Acquire Other Property, Plant, and Equipment                 4,280 353 885
Total assets 73,241       60,430       73,241 60,430 39,206
Income (Loss) from Continuing Operations Attributable to Parent                 (7,854) (3,230) (1,921)
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Operating revenues                 0 0 (550)
Resource costs                 0 0 0
Other operating expenses                 0 0 (550)
Depreciation and amortization                 0 0 0
Income from operations                 0 0 0
Interest expense                 (189) (132) (132)
Total income tax expense                 0 0 0
Payments to Acquire Other Property, Plant, and Equipment                 0 0 0
Total assets $ (15,075)       $ 0       (15,075) 0 0
Income (Loss) from Continuing Operations Attributable to Parent                 $ 0 $ 0 $ 0