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Revenue Recognition - Changes in Deferred Revenue Balances (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Deferred Revenue Arrangement [Line Items]  
Gross deferred revenue, beginning balance $ 39,544
Revenue earned from balances existing (36,408)
Billings during period 590,851 [1]
Revenue earned for new billings during the period (542,137)
Other adjustments (156)
Gross deferred revenue, ending balance 51,694
University Group [Member] | CTU [Member]  
Deferred Revenue Arrangement [Line Items]  
Gross deferred revenue, beginning balance 23,933
Revenue earned from balances existing (22,218)
Billings during period 373,671 [1]
Revenue earned for new billings during the period (351,040)
Other adjustments (96)
Gross deferred revenue, ending balance 24,250
University Group [Member] | AIU [Member]  
Deferred Revenue Arrangement [Line Items]  
Gross deferred revenue, beginning balance 15,507
Revenue earned from balances existing (14,086)
Billings during period 216,670 [1]
Revenue earned for new billings during the period (190,632)
Other adjustments (15)
Gross deferred revenue, ending balance 27,444
All Other Campuses [Member]  
Deferred Revenue Arrangement [Line Items]  
Gross deferred revenue, beginning balance 104
Revenue earned from balances existing (104)
Billings during period 510 [1]
Revenue earned for new billings during the period (465)
Other adjustments $ (45)
[1] Billings during period includes adjustments for prior billings.