GOODWILL (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended			9 Months Ended				9 Months Ended			9 Months Ended
	Dec. 31, 2012 item	Sep. 30, 2013	Sep. 30, 2013 Livemocha, Inc.	Apr. 02, 2013 Livemocha, Inc.	Sep. 30, 2013 Lexia	Aug. 01, 2013 Lexia	Sep. 30, 2013 North America Consumer	Dec. 31, 2012 North America Consumer	Sep. 30, 2013 North America Consumer Livemocha, Inc.	Sep. 30, 2013 Rest of World Consumer	Dec. 31, 2012 Rest of World Consumer	Sep. 30, 2013 Global Enterprise and Education	Sep. 30, 2013 Global Enterprise and Education Livemocha, Inc.	Sep. 30, 2013 Global Enterprise and Education Lexia
GOODWILL.
Impairment of goodwill		$ 0
Number of reportable segments	3
Changes in goodwill
Balance at the beginning of the period		34,896		5,142		9,938	17,921	13,499		2,199	2,199	19,198
Acquisition			5,142		9,938				4,422				720	9,938
Effect of change in foreign currency rate		(4)										(4)
Balance at the end of the period	$ 34,896	$ 49,972		$ 5,142		$ 9,938	$ 17,921	$ 13,499		$ 2,199	$ 2,199	$ 29,852