Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		$ 51,694	$ 39,544
Revenue earned from balances existing, beginning		(44,113)	(36,408)
Billings during period	[1]	635,826	590,851
Revenue earned for new billings during the period		(580,943)	(542,137)
Other adjustments		740	(156)
Gross deferred revenue, ending balance		63,204	51,694
University Group [Member] | CTU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		24,250	23,933
Revenue earned from balances existing, beginning		(22,289)	(22,218)
Billings during period	[1]	392,818	373,671
Revenue earned for new billings during the period		(367,563)	(351,040)
Other adjustments		629	(96)
Gross deferred revenue, ending balance		27,845	24,250
University Group [Member] | AIU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		27,444	15,507
Revenue earned from balances existing, beginning		(21,824)	(14,086)
Billings during period	[1]	243,008	216,670
Revenue earned for new billings during the period		(213,380)	(190,632)
Other adjustments		111	(15)
Gross deferred revenue, ending balance		$ 35,359	27,444
Corporate and Other [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance	[2]		104
Revenue earned from balances existing, beginning	[2]		(104)
Billings during period	[1],[2]		510
Revenue earned for new billings during the period	[2]		(465)
Other adjustments	[2]		$ (45)

[1] Billings during period includes adjustments for prior billings.

[2] Revenue recorded within Corporate and Other relates to closed campuses which are now reported within this category.