EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012	Jul. 03, 2012 T W Investor [Member]
Net (loss) / income attributable to CME Ltd.	$ (40,957)		$ 3,956		$ (149,238)		$ (9,436)
Preferred Stock Dividends and Other Adjustments	247		0		247		0
Net Income (Loss) Available to Common Stockholders, Basic	(41,204)		3,956		(149,485)		(9,436)
Net (loss) / income attributable to CME Ltd. - Diluted	$ (40,957)		$ 3,956		$ (149,238)		$ (9,436)
Weighted average outstanding shares of common stock - basic (in shares)	122,115,000	[1]	66,501,000	[1]	105,349,000	[1]	65,447,000	[1]
Dilutive effect of employee stock options and RSUs (in shares)	0		31,000		0		0
Weighted average outstanding shares of common stock - diluted (in shares)	122,115,000		66,532,000		105,349,000		65,447,000
Net loss per share:
Basic (in dollars per share)	$ (0.34)		$ 0.06		$ (1.42)		$ (0.14)
Diluted (in dollars per share)	$ (0.34)		$ 0.06		$ (1.42)		$ (0.14)
Convertible preferred stock, shares issued upon conversion										11,211,449
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount					3,309,603				3,087,087

[1] For the purpose of computing basic earnings per share, the 11,211,449 shares of Class A common stock underlying the Series A Preferred Share are included in the weighted average outstanding shares of common stock - basic, primarily because the holder of the Series A Preferred Share is entitled to receive any dividends payable when dividends are declared by the Board of Directors with respect to any shares of common stock.