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Revenue Recognition - Summary of Disaggregation of Revenue by Major Source (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation Of Revenue [Line Items]        
Total revenue $ 175,539 $ 176,035 $ 359,177 $ 347,029
University Group [Member] | CTU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 102,035 100,193 207,857 203,781
University Group [Member] | AIU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 73,223 75,835 150,700 [1] 143,231 [1]
Corporate and Other [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue [2],[3] 281 7 620 17
Tuition [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 165,846 167,208 339,949 329,304
Tuition [Member] | University Group [Member] | CTU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 95,723 94,204 195,328 191,755
Tuition [Member] | University Group [Member] | AIU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 70,123 73,004 144,621 137,549
Technology Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 8,403 7,795 16,681 15,572
Technology Fees [Member] | University Group [Member] | CTU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 5,530 5,162 11,013 10,282
Technology Fees [Member] | University Group [Member] | AIU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 2,873 2,633 5,668 5,290
Other Miscellaneous Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue [4] 555 496 1,005 1,017
Other Miscellaneous Fees [Member] | University Group [Member] | CTU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue [4] 389 323 681 695
Other Miscellaneous Fees [Member] | University Group [Member] | AIU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue [4] 166 173 324 322
Tuition and Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 174,804 175,499 357,635 345,893
Tuition and Fees [Member] | University Group [Member] | CTU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 101,642 99,689 207,022 202,732
Tuition and Fees [Member] | University Group [Member] | AIU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue 73,162 75,810 150,613 143,161
Other [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue [5] 735 536 1,542 1,136
Other [Member] | University Group [Member] | CTU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue [5] 393 504 835 1,049
Other [Member] | University Group [Member] | AIU [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue [5] 61 25 87 70
Other [Member] | Corporate and Other [Member]        
Disaggregation Of Revenue [Line Items]        
Total revenue [3],[5] $ 281 $ 7 $ 620 $ 17
[1] AIU’s revenue and operating income for the year to date ended June 30, 2020, include results of operations related to Trident from the March 2, 2020 date of acquisition and therefore do not reflect a full period of activity for Trident.
[2] Corporate and Other includes results of operations and total assets for closed campuses.
[3] Revenue recorded within Corporate and Other relates to miscellaneous non-student related revenue.
[4] Other miscellaneous fees include student activity fees and graduation fees.
[5] Other revenue primarily includes contract training revenue and miscellaneous non-student related revenue.