Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill) (Details 1) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,043,093
Accumulated impairment losses, beginning balance	(482,140)
Goodwill, net, beginning balance	1,560,953
Measurement period adjustments	(2,217)
Acquisitions	44,968
Impairment	(97,999)
Foreign currency exchange rate changes	(5,998)
Goodwill, ending balance	2,079,846
Accumulated impairment losses, ending balance	(580,139)
Goodwill, net, ending balance	1,499,707
Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	1,145,502
Accumulated impairment losses, beginning balance	(331,151)
Goodwill, net, beginning balance	814,351
Measurement period adjustments	0
Acquisitions	0
Impairment	0
Foreign currency exchange rate changes	(5,998)
Goodwill, ending balance	1,139,504
Accumulated impairment losses, ending balance	(331,151)
Goodwill, net, ending balance	808,353
Education [Member] | Kaplan International [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	579,561
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	579,561
Foreign currency exchange rate changes	(6,009)
Goodwill, ending balance	573,552
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	573,552
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
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] | Supplemental Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	391,377
Accumulated impairment losses, beginning balance	(219,827)
Goodwill, net, beginning balance	171,550
Foreign currency exchange rate changes	11
Goodwill, ending balance	391,388
Accumulated impairment losses, ending balance	(219,827)
Goodwill, net, ending balance	171,561
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	(34,302)
Goodwill, net, beginning balance	200,691
Measurement period adjustments	0
Acquisitions	0
Impairment	(47,760)
Foreign currency exchange rate changes	0
Goodwill, ending balance	234,993
Accumulated impairment losses, ending balance	(82,062)
Goodwill, net, ending balance	152,931
Healthcare [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	135,870
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	135,870
Measurement period adjustments	(2,217)
Acquisitions	385
Impairment	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	134,038
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	134,038
Automotive [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	84,697
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	84,697
Measurement period adjustments	0
Acquisitions	44,583
Impairment	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	129,280
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	129,280
Other Businesses [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	251,216
Accumulated impairment losses, beginning balance	(116,687)
Goodwill, net, beginning balance	134,529
Measurement period adjustments	0
Acquisitions	0
Impairment	(50,239)
Foreign currency exchange rate changes	0
Goodwill, ending balance	251,216
Accumulated impairment losses, ending balance	(166,926)
Goodwill, net, ending balance	$ 84,290