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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance $ 67,485 $ 121,467 $ 113,719 $ 85,402
Business acquisition, beginning balance 2,419 5,356 2,419 5,356
Revenue earned from prior balances (55,140) (99,501) (95,493) (72,203)
Billings during period [1] 195,834 137,209 496,054 531,319
Revenue earned for new billings during the period (111,297) (73,094) (418,167) (458,027)
Other adjustments (593) 650 176 240
Gross deferred revenue, ending balance 98,708 92,087 98,708 92,087
University Group [Member] | CTU [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 28,857 77,818 64,674 28,522
Business acquisition, beginning balance   3,952   3,952
Revenue earned from prior balances (23,765) (66,878) (56,274) (26,183)
Billings during period [1] 142,580 90,662 318,191 348,307
Revenue earned for new billings during the period (72,826) (37,469) (252,617) (285,186)
Other adjustments (1,003) 951 (131) (376)
Gross deferred revenue, ending balance 73,843 69,036 73,843 69,036
University Group [Member] | AIUS [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 38,628 43,649 49,045 56,880
Business acquisition, beginning balance 2,419 1,404 2,419 1,404
Revenue earned from prior balances (31,375) (32,623) (39,219) (46,020)
Billings during period [1] 53,254 46,547 177,863 183,012
Revenue earned for new billings during the period (38,471) (35,625) (165,550) (172,841)
Other adjustments 410 (301) 307 616
Gross deferred revenue, ending balance $ 24,865 $ 23,051 $ 24,865 $ 23,051
[1] Billings during period includes adjustments for prior billings.