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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Deferred Revenue Arrangement [Line Items]        
Business acquisition, beginning balance       $ 13,395
Gross deferred revenue, beginning balance $ 58,022 $ 56,920 $ 85,402 63,204
Revenue earned from prior balances (49,791) (48,167) (70,507) (63,900)
Billings during period [1] 239,765 185,807 394,110 335,499
Revenue earned for new billings during the period (125,013) (127,332) (287,128) (281,993)
Other adjustments (1,516) 589 (410) 1,612
Gross deferred revenue, ending balance 121,467 67,817 121,467 67,817
University Group [Member] | CTU [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 25,136 27,986 28,522 27,845
Revenue earned from prior balances (22,814) (25,238) (25,698) (24,367)
Billings during period [1] 155,861 99,464 257,645 202,508
Revenue earned for new billings during the period (78,828) (74,451) (181,324) (178,365)
Other adjustments (1,537) 331 (1,327) 471
Gross deferred revenue, ending balance 77,818 28,092 77,818 28,092
University Group [Member] | AIU [Member]        
Deferred Revenue Arrangement [Line Items]        
Business acquisition, beginning balance       13,395
Gross deferred revenue, beginning balance 32,886 28,934 56,880 35,359
Revenue earned from prior balances (26,977) (22,929) (44,809) (39,533)
Billings during period [1] 83,904 86,343 136,465 132,991
Revenue earned for new billings during the period (46,185) (52,881) (105,804) (103,628)
Other adjustments 21 258 917 1,141
Gross deferred revenue, ending balance $ 43,649 $ 39,725 $ 43,649 $ 39,725
[1] Billings during period includes adjustments for prior billings.