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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance $ 56,920 $ 36,081 $ 63,204 $ 51,694
Business acquisition, beginning balance     13,395  
Revenue earned from prior balances (48,167) (32,539) (63,900) (44,120)
Billings during period [1] 185,807 164,792 335,499 305,341
Revenue earned for new billings during the period (127,332) (123,240) (281,993) (268,887)
Other adjustments 589 707 1,612 1,773
Gross deferred revenue, ending balance 67,817 45,801 67,817 45,801
University Group [Member] | CTU [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 27,986 25,901 27,845 24,250
Revenue earned from prior balances (25,238) (23,679) (24,367) (22,335)
Billings during period [1] 99,464 95,424 202,508 192,940
Revenue earned for new billings during the period (74,451) (72,277) (178,365) (170,112)
Other adjustments 331 456 471 1,082
Gross deferred revenue, ending balance 28,092 25,825 28,092 25,825
University Group [Member] | AIU [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 28,934 10,180 35,359 27,444
Business acquisition, beginning balance     13,395  
Revenue earned from prior balances (22,929) (8,860) (39,533) (21,785)
Billings during period [1] 86,343 69,368 132,991 112,401
Revenue earned for new billings during the period (52,881) (50,963) (103,628) (98,775)
Other adjustments 258 251 1,141 691
Gross deferred revenue, ending balance $ 39,725 $ 19,976 $ 39,725 $ 19,976
[1] Billings during period includes adjustments for prior billings.