Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill) (Details 1) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,734,731
Accumulated impairment losses, beginning balance	(346,452)
Goodwill, net, beginning balance	1,388,279
Measurement period adjustments	154
Acquisitions	76,920
Impairment	(6,878)
Foreign currency exchange rate changes	(18,096)
Goodwill, ending balance	1,793,709
Accumulated impairment losses, ending balance	(353,330)
Goodwill, net, ending balance	1,440,379
Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	1,140,958
Accumulated impairment losses, beginning balance	(331,151)
Goodwill, net, beginning balance	809,807
Measurement period adjustments	154
Acquisitions	13,022
Impairment	0
Foreign currency exchange rate changes	(18,096)
Goodwill, ending balance	1,136,038
Accumulated impairment losses, ending balance	(331,151)
Goodwill, net, ending balance	804,887
Education [Member] | Kaplan International [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	595,604
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	595,604
Measurement period adjustments	154
Acquisitions	9,788
Foreign currency exchange rate changes	(18,013)
Goodwill, ending balance	587,533
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	587,533
Education [Member] | Higher Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	174,564
Accumulated impairment losses, beginning balance	(111,324)
Goodwill, net, beginning balance	63,240
Measurement period adjustments	0
Acquisitions	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	174,564
Accumulated impairment losses, ending balance	(111,324)
Goodwill, net, ending balance	63,240
Education [Member] | Test Preparation [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	166,920
Accumulated impairment losses, beginning balance	(102,259)
Goodwill, net, beginning balance	64,661
Measurement period adjustments	0
Acquisitions	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	166,920
Accumulated impairment losses, ending balance	(102,259)
Goodwill, net, ending balance	64,661
Education [Member] | Professional (U.S.) [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	203,870
Accumulated impairment losses, beginning balance	(117,568)
Goodwill, net, beginning balance	86,302
Measurement period adjustments	0
Acquisitions	3,234
Foreign currency exchange rate changes	(83)
Goodwill, ending balance	207,021
Accumulated impairment losses, ending balance	(117,568)
Goodwill, net, ending balance	89,453
Television Broadcasting [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	190,815
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	190,815
Measurement period adjustments	0
Acquisitions	0
Impairment	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	190,815
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	190,815
Manufacturing [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	234,993
Accumulated impairment losses, beginning balance	(7,616)
Goodwill, net, beginning balance	227,377
Measurement period adjustments	0
Acquisitions	0
Impairment	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	234,993
Accumulated impairment losses, ending balance	(7,616)
Goodwill, net, ending balance	227,377
Healthcare [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	98,421
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	98,421
Measurement period adjustments	0
Acquisitions	0
Impairment	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	98,421
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	98,421
SocialCode [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	15,860
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	15,860
Measurement period adjustments	0
Acquisitions	0
Impairment	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	15,860
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	15,860
Other Businesses [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	53,684
Accumulated impairment losses, beginning balance	(7,685)
Goodwill, net, beginning balance	45,999
Measurement period adjustments	0
Acquisitions	63,898
Impairment	(6,878)
Foreign currency exchange rate changes	0
Goodwill, ending balance	117,582
Accumulated impairment losses, ending balance	(14,563)
Goodwill, net, ending balance	$ 103,019