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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance $ 36,081 $ 45,582 $ 51,694 $ 39,544
Revenue earned from balances existing (32,539) (40,909) (44,120) (36,624)
Billings during period [1] 164,792 132,757 305,341 285,984
Revenue earned for new billings during the period (123,240) (100,435) (268,887) (252,230)
Other adjustments 707 265 1,773 586
Gross deferred revenue, ending balance 45,801 37,260 45,801 37,260
University Group [Member] | CTU [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 25,901 24,025 24,250 23,933
Revenue earned from balances existing (23,679) (22,347) (22,335) (22,210)
Billings during period [1] 95,424 92,201 192,940 186,097
Revenue earned for new billings during the period (72,277) (70,290) (170,112) (164,535)
Other adjustments 456 165 1,082 469
Gross deferred revenue, ending balance 25,825 23,754 25,825 23,754
University Group [Member] | AIU [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance 10,180 21,415 27,444 15,507
Revenue earned from balances existing (8,860) (18,420) (21,785) (14,310)
Billings during period [1] 69,368 40,457 112,401 99,392
Revenue earned for new billings during the period (50,963) (30,108) (98,775) (87,289)
Other adjustments 251 92 691 136
Gross deferred revenue, ending balance $ 19,976 13,436 $ 19,976 13,436
Corporate and Other [Member]        
Deferred Revenue Arrangement [Line Items]        
Gross deferred revenue, beginning balance [2]   142   104
Revenue earned from balances existing [2]   (142)   (104)
Billings during period [1],[2]   99   495
Revenue earned for new billings during the period [2]   (37)   (406)
Other adjustments [2]   8   (19)
Gross deferred revenue, ending balance [2]   $ 70   $ 70
[1] Billings during period includes adjustments for prior billings.
[2] Revenue recorded within Corporate and Other relates to closed campuses which are now reported within this category.