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Fair Value (Fair Value Of Assets And Liabilities Measured On Recurring Basis) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Assets $ 2,751 $ 1,324
Foreign currency derivatives, Assets   32
Interest rate swaps, Assets 5,069  
Cash and cash equivalents 31,874 21,957
Securities available for sale 82,352 96,579
Funds held in trust account of Spokane Energy 1,600 1,600
Assets, Total 131,608 128,860
Energy commodity derivatives, Liabilities 42,070 98,496
Interest rate swaps, Liabilities 3,827 18,895
Foreign currency derivatives, Liabilities 30  
Liabilities, Total 68,493 130,249
Power Exchange Agreements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Liabilities 17,876 9,910
US Government Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 63,458 74,893
Municipal [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 5,182 425
Corporate Fixed Income - Financial [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 6,634 11,154
Corporate Fixed Income - Industrial [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 4,999 6,518
Corporate Fixed Income - Utility [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 1,068 2,092
Certificates Of Deposit [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 1,011 1,497
Fixed Income Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets 2,148 [1] 2,116 [1]
Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets 5,814 [1] 5,252 [1]
Natural Gas Exchange Agreements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Liabilities 3,105 1,688
Power Option Agreements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Liabilities 1,585 1,260
Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 31,874 21,957
Funds held in trust account of Spokane Energy 1,600 1,600
Assets, Total 41,436 30,925
Level 1 [Member] | Fixed Income Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets 2,148 [1] 2,116 [1]
Level 1 [Member] | Equity Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred compensation assets 5,814 [1] 5,252 [1]
Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Assets 76,695 80,571
Foreign currency derivatives, Assets   32
Interest rate swaps, Assets 5,069  
Assets, Total 164,116 177,182
Energy commodity derivatives, Liabilities 125,488 177,743
Interest rate swaps, Liabilities 3,827 18,895
Foreign currency derivatives, Liabilities 30  
Liabilities, Total 129,345 196,638
Level 2 [Member] | US Government Agencies [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 63,458 74,893
Level 2 [Member] | Municipal [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 5,182 425
Level 2 [Member] | Corporate Fixed Income - Financial [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 6,634 11,154
Level 2 [Member] | Corporate Fixed Income - Industrial [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 4,999 6,518
Level 2 [Member] | Corporate Fixed Income - Utility [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 1,068 2,092
Level 2 [Member] | Certificates Of Deposit [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities available for sale 1,011 1,497
Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Total 366 5,630
Liabilities, Total 22,932 18,488
Level 3 [Member] | Power Exchange Agreements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Assets 366 4,674
Energy commodity derivatives, Liabilities 18,242 14,584
Level 3 [Member] | Natural Gas Exchange Agreements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Assets   956
Energy commodity derivatives, Liabilities 3,105 2,644
Level 3 [Member] | Power Option Agreements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Liabilities 1,585 1,260
Counterparty Netting [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Assets (73,944) [2] (79,247) [2]
Assets, Total (74,310) [2] (84,877) [2]
Energy commodity derivatives, Liabilities (83,418) [2] (79,247) [2]
Liabilities, Total (83,784) [2] (84,877) [2]
Counterparty Netting [Member] | Power Exchange Agreements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Assets (366) [2] (4,674) [2]
Energy commodity derivatives, Liabilities (366) [2] (4,674) [2]
Counterparty Netting [Member] | Natural Gas Exchange Agreements [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Energy commodity derivatives, Assets   (956) [2]
Energy commodity derivatives, Liabilities   $ (956) [2]
[1] These assets are trading securities and are included in other intangibles, property and investments-net on the Condensed Consolidated Balance Sheets.
[2] The Company is permitted to net derivative assets and derivative liabilities with the same counterparty when a legally enforceable master netting agreement exists. In addition, the Company nets derivative assets and derivative liabilities against any payables and receivables for cash collateral held or placed with these same counterparties.