Goodwill and Other Intangible Assets (Changes in Carrying Amount of Goodwill) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,838,080	$ 1,734,731
Accumulated impairment losses, beginning balance	(353,330)	(346,452)
Goodwill, net, beginning balance	1,484,750	1,388,279
Measurement period adjustment		154
Acquisitions	205,003	73,950
Impairment	(26,686)	(6,878)
Foreign currency exchange rate changes	(13,485)	29,245
Goodwill, ending balance	2,029,598	1,838,080
Accumulated impairment losses, ending balance	(380,016)	(353,330)
Goodwill, net, ending balance	1,649,582	1,484,750
Education [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	1,183,379	1,140,958
Accumulated impairment losses, beginning balance	(331,151)	(331,151)
Goodwill, net, beginning balance	852,228	809,807
Measurement period adjustment		154
Acquisitions	16,342	13,022
Impairment	0	0
Foreign currency exchange rate changes	(13,485)	29,245
Goodwill, ending balance	1,186,236	1,183,379
Accumulated impairment losses, ending balance	(331,151)	(331,151)
Goodwill, net, ending balance	855,085	852,228
Education [Member] | Kaplan International [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	634,749	595,604
Accumulated impairment losses, beginning balance	0	0
Goodwill, net, beginning balance	634,749	595,604
Measurement period adjustment		154
Acquisitions	0	9,788
Foreign currency exchange rate changes	(13,481)	29,203
Goodwill, ending balance	621,268	634,749
Accumulated impairment losses, ending balance	0	0
Goodwill, net, ending balance	621,268	634,749
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
Acquisitions	0	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	374,066	370,790
Accumulated impairment losses, beginning balance	(219,827)	(219,827)
Goodwill, net, beginning balance	154,239	150,963
Measurement period adjustment		0
Acquisitions	16,342	3,234
Foreign currency exchange rate changes	(4)	42
Goodwill, ending balance	390,404	374,066
Accumulated impairment losses, ending balance	(219,827)	(219,827)
Goodwill, net, ending balance	170,577	154,239
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
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	(7,616)	(7,616)
Goodwill, net, beginning balance	227,377	227,377
Measurement period adjustment		0
Acquisitions	0	0
Impairment	(26,686)	0
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	234,993	234,993
Accumulated impairment losses, ending balance	(34,302)	(7,616)
Goodwill, net, ending balance	200,691	227,377
Graham Healthcare Group [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	98,421	98,421
Accumulated impairment losses, beginning balance	0	0
Goodwill, net, beginning balance	98,421	98,421
Measurement period adjustment		0
Acquisitions	19,908	0
Impairment	0	0
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	118,329	98,421
Accumulated impairment losses, ending balance	0	0
Goodwill, net, ending balance	118,329	98,421
Automotive [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	39,121	39,121
Accumulated impairment losses, beginning balance	0	0
Goodwill, net, beginning balance	39,121	39,121
Measurement period adjustment		0
Acquisitions	6,705	0
Impairment	0	0
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	45,826	39,121
Accumulated impairment losses, ending balance	0	0
Goodwill, net, ending balance	45,826	39,121
Other Businesses [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	91,351	30,423
Accumulated impairment losses, beginning balance	(14,563)	(7,685)
Goodwill, net, beginning balance	76,788	22,738
Measurement period adjustment		0
Acquisitions	162,048	60,928
Impairment	0	(6,878)
Foreign currency exchange rate changes	0	0
Goodwill, ending balance	253,399	91,351
Accumulated impairment losses, ending balance	(14,563)	(14,563)
Goodwill, net, ending balance	$ 238,836	$ 76,788