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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance $ 67,817 $ 45,801 $ 63,204 $ 51,694
Business acquisition, beginning balance     13,395  
Revenue earned from prior balances (56,271) (40,345) (63,280) (44,068)
Billings during period [1] 156,817 144,173 492,316 449,514
Revenue earned for new billings during the period (112,200) (113,946) (451,084) (423,230)
Other adjustments (1,107) (72) 505 1,701
Gross deferred revenue, ending balance 55,056 35,611 55,056 35,611
University Group [Member] | CTU [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 28,092 25,825 27,845 24,250
Revenue earned from prior balances (25,035) (23,375) (24,376) (22,289)
Billings during period [1] 99,219 96,863 301,727 289,803
Revenue earned for new billings during the period (73,411) (72,054) (276,802) (265,587)
Other adjustments (777) (146) (306) 936
Gross deferred revenue, ending balance 28,088 27,113 28,088 27,113
University Group [Member] | AIU [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 39,725 19,976 35,359 27,444
Business acquisition, beginning balance     13,395  
Revenue earned from prior balances (31,236) (16,970) (38,904) (21,779)
Billings during period [1] 57,598 47,310 190,589 159,711
Revenue earned for new billings during the period (38,789) (41,892) (174,282) (157,643)
Other adjustments (330) 74 811 765
Gross deferred revenue, ending balance $ 26,968 $ 8,498 $ 26,968 $ 8,498
[1] Billings during period includes adjustments for prior billings.