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Selected Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]  
Summary of Quarterly Operations
 
Three Months Ended
 
March 31
 
June 30
 
September 30
 
December 31
2017
 
 
 
 
 
 
 
Operating revenues
$
436,470

 
$
314,501

 
$
297,096

 
$
397,862

Operating expenses
321,084

 
258,404

 
266,054

 
315,878

Income from operations
$
115,386

 
$
56,097

 
$
31,042

 
$
81,984

Net income
62,137

 
21,722

 
4,458

 
27,615

Net loss (income) attributable to noncontrolling interests
(21
)
 
49

 
(7
)
 
(37
)
Net income attributable to Avista Corporation shareholders
$
62,116

 
$
21,771

 
$
4,451

 
$
27,578

Outstanding common stock:
 
 
 
 
 
 
 
weighted-average, basic
64,362

 
64,401

 
64,412

 
64,809

weighted-average, diluted
64,469

 
64,553

 
64,892

 
65,308

Earnings per common share attributable to Avista Corp. shareholders, diluted
$
0.96

 
$
0.34

 
$
0.07

 
$
0.42

 
Three Months Ended
 
March 31
 
June 30
 
September 30
 
December 31
2016
 
 
 
 
 
 
 
Operating revenues from continuing operations
$
418,173

 
$
318,838

 
$
303,349

 
$
402,123

Operating expenses from continuing operations
312,088

 
257,247

 
263,755

 
319,590

Income from continuing operations
$
106,085

 
$
61,591

 
$
39,594

 
$
82,533

Net income
57,665

 
27,287

 
12,261

 
40,103

Net income attributable to noncontrolling interests
(16
)
 
(33
)
 
(27
)
 
(12
)
Net income attributable to Avista Corporation shareholders
$
57,649

 
$
27,254

 
$
12,234

 
$
40,091

Outstanding common stock:
 
 
 
 
 
 
 
weighted-average, basic
62,605

 
63,386

 
63,857

 
64,185

weighted-average, diluted
62,907

 
63,783

 
64,325

 
64,620

Earnings per common share attributable to Avista Corp. shareholders, diluted
$
0.92

 
$
0.43

 
$
0.19

 
$
0.62