ACQUISITION OF NONCONTROLLING INTEREST IN GEOSTREAM (Details) (USD $)	3 Months Ended		6 Months Ended		10 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 01, 2009	Apr. 09, 2013	Oct. 31, 2008
Noncontrolling Interest [Line Items]
Net Income (loss) attributable to Key	$ (4,128,000)	$ 29,041,000	$ (4,402,000)	$ 32,231,000
Increase in Key's paid-in capital for purchase of the 50% non controlling interest in Geostream			(13,114,000)
Net transfers from noncontrolling interest	22,432,000	0	22,432,000	0
Change from net income (loss) attributable to Key and transfers from noncontrolling interest	18,304,000	29,041,000	18,030,000	32,231,000
Geostream
Noncontrolling Interest [Line Items]
Percentage of acquired interest	50.00%		50.00%			50.00%	26.00%
Aggregate cost of acquired interest						14,600,000	17,400,000
Business combination, percentage of voting interests acquired					24.00%
Business combination, cost of acquired interest					16,400,000
Total controlling interest, percentage					50.00%
Increase in Key's paid-in capital for purchase of the 50% non controlling interest in Geostream	$ 22,432,000	$ 0	$ 22,432,000	$ 0