Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 2,043,093	$ 2,029,598
Accumulated impairment losses, beginning balance	(482,140)	(380,016)
Goodwill, net, beginning balance	1,560,953	1,649,582
Measurement period adjustment	(2,217)	(853)
Acquisitions	45,968	56,163
Impairment	(97,999)	(102,124)
Foreign currency exchange rate changes	18,489	(41,815)
Goodwill, ending balance	2,105,333	2,043,093
Accumulated impairment losses, ending balance	(580,139)	(482,140)
Goodwill, net, ending balance	1,525,194	1,560,953
Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	1,145,502	1,186,236
Accumulated impairment losses, beginning balance	(331,151)	(331,151)
Goodwill, net, beginning balance	814,351	855,085
Measurement period adjustment	0	1,081
Acquisitions	0	0
Impairment	0	0
Foreign currency exchange rate changes	18,489	(41,815)
Goodwill, ending balance	1,163,991	1,145,502
Accumulated impairment losses, ending balance	(331,151)	(331,151)
Goodwill, net, ending balance	832,840	814,351
Education [Member] | Kaplan International [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	579,561	621,268
Accumulated impairment losses, beginning balance	0	0
Goodwill, net, beginning balance	579,561	621,268
Measurement period adjustment		0
Foreign currency exchange rate changes	18,439	(41,707)
Goodwill, ending balance	598,000	579,561
Accumulated impairment losses, ending balance	0	0
Goodwill, net, ending balance	598,000	579,561
Education [Member] | Higher Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	174,564	174,564
Accumulated impairment losses, beginning balance	(111,324)	(111,324)
Goodwill, net, beginning balance	63,240	63,240
Measurement period adjustment		0
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	174,564	174,564
Accumulated impairment losses, ending balance	(111,324)	(111,324)
Goodwill, net, ending balance	63,240	63,240
Education [Member] | Supplemental Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	391,377	390,404
Accumulated impairment losses, beginning balance	(219,827)	(219,827)
Goodwill, net, beginning balance	171,550	170,577
Measurement period adjustment		1,081
Foreign currency exchange rate changes	50	(108)
Goodwill, ending balance	391,427	391,377
Accumulated impairment losses, ending balance	(219,827)	(219,827)
Goodwill, net, ending balance	171,600	171,550
Television Broadcasting [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	190,815	190,815
Accumulated impairment losses, beginning balance	0	0
Goodwill, net, beginning balance	190,815	190,815
Measurement period adjustment	0	0
Acquisitions	0	0
Impairment	0	0
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	190,815	190,815
Accumulated impairment losses, ending balance	0	0
Goodwill, net, ending balance	190,815	190,815
Manufacturing [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	234,993	234,993
Accumulated impairment losses, beginning balance	(34,302)	(34,302)
Goodwill, net, beginning balance	200,691	200,691
Measurement period adjustment	0	0
Acquisitions	0	0
Impairment	(47,760)	0
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	234,993	234,993
Accumulated impairment losses, ending balance	(82,062)	(34,302)
Goodwill, net, ending balance	152,931	200,691
Graham Healthcare Group [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	135,870	118,329
Accumulated impairment losses, beginning balance	0	0
Goodwill, net, beginning balance	135,870	118,329
Measurement period adjustment	(2,217)	249
Acquisitions	1,385	17,292
Impairment	0	0
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	135,038	135,870
Accumulated impairment losses, ending balance	0	0
Goodwill, net, ending balance	135,038	135,870
Automotive [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	84,697	45,826
Accumulated impairment losses, beginning balance	0	0
Goodwill, net, beginning balance	84,697	45,826
Measurement period adjustment	0	0
Acquisitions	44,583	38,871
Impairment	0	0
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	129,280	84,697
Accumulated impairment losses, ending balance	0	0
Goodwill, net, ending balance	129,280	84,697
Other Businesses [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	251,216	253,399
Accumulated impairment losses, beginning balance	(116,687)	(14,563)
Goodwill, net, beginning balance	134,529	238,836
Measurement period adjustment	0	(2,183)
Acquisitions	0	0
Impairment	(50,239)	(102,124)
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	251,216	251,216
Accumulated impairment losses, ending balance	(166,926)	(116,687)
Goodwill, net, ending balance	$ 84,290	$ 134,529