Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill) (Details 1) $ in Thousands	3 Months Ended
	Mar. 31, 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
Acquisitions	385
Foreign currency exchange rate changes	6,256
Goodwill, ending balance	2,049,734
Accumulated impairment losses, ending balance	(482,140)
Goodwill, net, ending balance	1,567,594
Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	1,145,502
Accumulated impairment losses, beginning balance	(331,151)
Goodwill, net, beginning balance	814,351
Acquisitions	0
Foreign currency exchange rate changes	6,256
Goodwill, ending balance	1,151,758
Accumulated impairment losses, ending balance	(331,151)
Goodwill, net, ending balance	820,607
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	6,252
Goodwill, ending balance	585,813
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	585,813
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	4
Goodwill, ending balance	391,381
Accumulated impairment losses, ending balance	(219,827)
Goodwill, net, ending balance	171,554
Television Broadcasting [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	190,815
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	190,815
Acquisitions	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
Acquisitions	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	234,993
Accumulated impairment losses, ending balance	(34,302)
Goodwill, net, ending balance	200,691
Healthcare [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	135,870
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	135,870
Acquisitions	385
Foreign currency exchange rate changes	0
Goodwill, ending balance	136,255
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	136,255
Automotive [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	84,697
Accumulated impairment losses, beginning balance	0
Goodwill, net, beginning balance	84,697
Acquisitions	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	84,697
Accumulated impairment losses, ending balance	0
Goodwill, net, ending balance	84,697
Other Businesses [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	251,216
Accumulated impairment losses, beginning balance	(116,687)
Goodwill, net, beginning balance	134,529
Acquisitions	0
Foreign currency exchange rate changes	0
Goodwill, ending balance	251,216
Accumulated impairment losses, ending balance	(116,687)
Goodwill, net, ending balance	$ 134,529