Commitments And Contingencies (Narrative) (Details) (USD $)	1 Months Ended		3 Months Ended		6 Months Ended				12 Months Ended	6 Months Ended			6 Months Ended
	May 31, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 item	Jun. 30, 2013	Jun. 30, 2014 Hotel Employees and Restaurant Employees [Member]	Jun. 30, 2014 International Brotherhood of Electrical Workers [Member] item	Dec. 31, 2013 Homer Electric Association, Inc. And Matanuska Electric Association, Inc. [Member]	Jun. 30, 2014 Matanuska Electric Association, Inc. [Member]	Jun. 30, 2014 Homer Electric Association, Inc. [Member]	Dec. 31, 2013 Homer Electric Association, Inc. [Member]	Jun. 30, 2014 GVEA Economy Energy Sales [Member]	Jun. 30, 2013 GVEA Economy Energy Sales [Member]	Jun. 30, 2014 ConocoPhillips (COP) [Member] MMcf	Jun. 30, 2014 Marathon Alaska Production, LLC [Member]	Jun. 30, 2014 Hilcorp Alaska - Cook Inlet [Member] MMcf
Commitments And Contingencies [Line Items]
Percentage of employees belonging to unions					70.00%
Number of collective bargaining agreements								3
Expiration date of collective bargaining agreements							Jun. 30, 2016	Jun. 30, 2017
Operating revenues			$ 70,269,305	$ 74,776,425	$ 146,368,191	$ 152,524,942			$ 103,100,000	$ 35,900,000			$ 21,900,000	$ 18,500,000
Customer percentage of operating revenue									34.00%	25.00%
Contract expiration for power										Dec. 31, 2014	Dec. 31, 2013
Number of contract extensions					2
Commencement date of long term contract for purchase of gas supply															Aug. 21, 2009	May 17, 2010	Jul. 01, 2013
Expiration date of long term contract for purchase of gas supply															Dec. 31, 2016	Dec. 31, 2014
Estimated amount of gas under contract															60,000		57,600
Percentage of fuel supply needs filled by contracts					100.00%
Commencement date of long term contract for economy energy sales													Oct. 05, 2012
Expiration date of long term contract for economy energy sales													Mar. 31, 2015
Number of years to return patronage capital after expiration of power agreement											5 years
Patronage capital payable		7,931,295	10,205,739		10,205,739					2,300,000	7,900,000	7,900,000
Retirement of patronage capital and estate payments	$ 5,300,000	$ 1,600,000
Name of plaintiff					Matanuska Electric Association, Inc.
Date of summons and complaint					May 14, 2013
Description of complaint					MEA fundamentally asked that Chugach be required to repatriate MEA's capital credits on the same basis as it promised, in a 2007 settlement, that it would repatriate HEA capital credits. After significant discussions, the parties reached an agreement to settle this litigation. The Superior Court issued an order dismissing the case without prejudice on June 5, 2014.