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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Deferred Revenue Arrangement [Line Items]    
Gross deferred revenue, beginning balance $ 107,200 $ 113,719
Business acquisitions, beginning balance   12,743
Revenue earned from prior balances (93,526) (98,703)
Billings during period [1] 661,843 669,309
Revenue earned for new billings during the period (609,394) (588,969)
Other adjustments (2,153) (899)
Gross deferred revenue, ending balance 63,970 107,200
University Group [Member] | CTU [Member]    
Deferred Revenue Arrangement [Line Items]    
Gross deferred revenue, beginning balance 67,245 64,674
Business acquisitions, beginning balance   10,324
Revenue earned from prior balances (60,232) (59,520)
Billings during period [1] 443,022 408,796
Revenue earned for new billings during the period (404,588) (356,843)
Other adjustments (2,916) (186)
Gross deferred revenue, ending balance 42,531 67,245
University Group [Member] | AIUS [Member]    
Deferred Revenue Arrangement [Line Items]    
Gross deferred revenue, beginning balance 39,955 49,045
Business acquisitions, beginning balance   2,419
Revenue earned from prior balances (33,294) (39,183)
Billings during period [1] 218,821 260,513
Revenue earned for new billings during the period (204,806) (232,126)
Other adjustments 763 (713)
Gross deferred revenue, ending balance $ 21,439 $ 39,955
[1] Billings during period includes adjustments for prior billings.