Unaudited Quarterly Results of Operations - Summarized Quarterly Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 362,164		$ 389,673		$ 411,390		$ 428,449		$ 466,471		$ 490,851		$ 515,997		$ 486,751		$ 1,591,676	$ 1,960,070	$ 1,729,211
Direct operating expenses	259,881		268,297		287,102		299,182		317,553		335,799		343,996		311,497		1,114,462	1,308,845	1,085,190
(Loss) Income from continuing operations	(12,518)		(4,697)		(3,772)		(186)		14,307		23,190		31,699		33,481		(21,173)	102,677	111,336
Net income (loss)	(12,518)		(4,697)		(3,772)		(186)		14,307		(37,019)		29,245		2,576		(21,173)	9,109	100,655
INCOME (LOSS) ATTRIBUTABLE TO KEY	$ (12,518)		$ (4,848)		$ (4,128)		$ (274)		$ 13,485		$ (38,094)		$ 29,041		$ 3,190		$ (21,768)	$ 7,622	$ 101,461
Earnings (loss) per share:
Basic and Diluted (usd per share)	$ (0.08)	[1]	$ (0.03)	[1]	$ (0.03)	[1]	$ 0.00	[1]	$ 0.09	[1]	$ (0.25)	[1]	$ 0.19	[1]	$ 0.02	[1]

[1] Quarterly earnings per common share are based on the weighted average number of shares outstanding during the quarter, and the sum of the quarters may not equal annual earnings per common share.