Discontinued Operations (Narrative) (Details) (USD $)	12 Months Ended				1 Months Ended			3 Months Ended		1 Months Ended	0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jan. 02, 2011	Jan. 02, 2011 Newsweek [Member]	Jul. 31, 2011 Kaplan Virtual Education [Member]	Oct. 31, 2011 Kaplan Compliance Solutions [Member]	Feb. 29, 2012 Sale of Kaplan Learning Technologies [Member]	Jun. 30, 2012 Sale of Kaplan EduNeering [Member]	Mar. 31, 2012 Sales of Kaplan EduNeering and Kaplan Learning Technologies [Member]	Aug. 31, 2012 Sale of Kidum [Member]	Jul. 31, 2012 Disposition of Avenue 100 Media Solutions Inc. [Member]
Pre-tax gain (loss) on sale and/or disposition	$ 23,759,000	$ 2,975,000	$ (9,156,000)							$ 3,600,000	$ (5,700,000)
After-tax gain (loss) on sale and/or disposition					(1,200,000)	1,500,000	(1,900,000)	18,500,000		10,200,000
Income tax benefits in connection with sales and/or dispositions of businesses									23,200,000		44,500,000
Pension credit excluded from reclassification				25,800,000
Accelerated depreciation and property, plant and equipment write-downs				$ 4,700,000