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Information By Business Segments (Information By Business Segments) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]          
Operating revenues $ 340,632 $ 343,710 $ 1,136,474 $ 1,180,853  
Resource costs 153,801 171,393 500,805 575,290  
Other operating expenses 107,096 92,305 321,734 284,542  
Depreciation and amortization 31,646 28,305 93,293 84,273  
Income from operations 29,999 34,878 157,020 175,227  
Interest expense 19,264 [1] 18,855 [1] 57,866 [1] 55,870 [1]  
Income taxes 1,608 3,717 33,106 40,937  
Net income attributable to Avista Corporation 5,786 10,702 62,352 75,621  
Capital expenditures 59,606 70,846 182,348 172,328  
Total Assets 4,190,256   4,190,256   4,214,531
Avista Utilities [Member]
         
Segment Reporting Information [Line Items]          
Operating revenues 292,535 302,001 992,210 1,060,571  
Resource costs 153,801 171,393 500,805 575,290  
Other operating expenses 64,449 60,579 191,407 188,961  
Depreciation and amortization 28,255 26,341 83,327 78,600  
Income from operations 27,940 26,859 153,049 156,199  
Interest expense 18,001 [1] 17,639 [1] 54,148 [1] 52,134 [1]  
Income taxes 2,590 1,546 34,425 35,857  
Net income attributable to Avista Corporation 7,660 7,582 65,157 68,733  
Capital expenditures 57,964 69,716 178,440 169,598  
Total Assets 3,732,530   3,732,530   3,809,446
Ecova [Member]
         
Segment Reporting Information [Line Items]          
Operating revenues 38,617 32,228 115,707 91,207  
Other operating expenses 33,868 23,790 104,392 72,220  
Depreciation and amortization 3,260 1,784 9,455 5,086  
Income from operations 1,489 6,654 1,860 13,901  
Interest expense 530 [1] 71 [1] 1,301 [1] 206 [1]  
Income taxes 495 2,416 918 5,005  
Net income attributable to Avista Corporation 640 3,467 962 7,016  
Capital expenditures 1,023 897 3,248 2,173  
Total Assets 357,457   357,457   292,940
Other [Member]
         
Segment Reporting Information [Line Items]          
Operating revenues 9,930 9,931 29,907 30,425  
Other operating expenses 9,229 8,386 27,285 24,711  
Depreciation and amortization 131 180 511 587  
Income from operations 570 1,365 2,111 5,127  
Interest expense 824 [1] 1,150 [1] 2,691 [1] 3,912 [1]  
Income taxes (1,477) (245) (2,237) 75  
Net income attributable to Avista Corporation (2,514) (347) (3,767) (128)  
Capital expenditures 619 233 660 557  
Total Assets 100,269   100,269   112,145
Non Utility [Member]
         
Segment Reporting Information [Line Items]          
Operating revenues 48,547 42,159 145,614 121,632  
Other operating expenses 43,097 32,176 131,677 96,931  
Depreciation and amortization 3,391 1,964 9,966 5,673  
Income from operations 2,059 8,019 3,971 19,028  
Interest expense 1,354 [1] 1,221 [1] 3,992 [1] 4,118 [1]  
Income taxes (982) 2,171 (1,319) 5,080  
Net income attributable to Avista Corporation (1,874) 3,120 (2,805) 6,888  
Capital expenditures 1,642 1,130 3,908 2,730  
Total Assets 457,726   457,726   405,085
Intersegment Elimination [Member]
         
Segment Reporting Information [Line Items]          
Operating revenues (450) [2] (450) [2] (1,350) [2] (1,350) [2]  
Other operating expenses (450) [2] (450) [2] (1,350) [2] (1,350) [2]  
Interest expense $ (91) [1],[2] $ (5) [1],[2] $ (274) [1],[2] $ (382) [1],[2]  
[1] Including interest expense to affiliated trusts.
[2] Intersegment eliminations reported as operating revenues and resource costs represent intercompany purchases and sales of electric capacity and energy. Intersegment eliminations reported as interest expense represent intercompany interest.