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Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Revenue $ 175,539 $ 176,035 $ 359,177 $ 347,029  
Percentage of total revenue 100.00% 100.00% 100.00% 100.00%  
Operating Income (Loss) $ 35,962 $ 37,368 $ 76,579 $ 74,671  
Total Assets [1] 786,419   786,419   $ 721,517
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Revenue [2],[3] $ 281 $ 7 $ 620 $ 17  
Percentage of total revenue [2] 0.20% 0.00% 0.10% 0.00%  
Operating Income (Loss) [2] $ (8,654) $ (6,184) $ (15,503) $ (12,876)  
Total Assets [1],[2] 526,106   526,106   482,993
CTU [Member] | University Group [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 102,035 $ 100,193 $ 207,857 $ 203,781  
Percentage of total revenue 58.10% 56.90% 57.90% 58.70%  
Operating Income (Loss) $ 35,398 $ 33,076 $ 71,541 $ 67,695  
Total Assets [1] 113,450   113,450   96,922
AIU [Member] | University Group [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 73,223 $ 75,835 $ 150,700 [4] $ 143,231 [4]  
Percentage of total revenue 41.70% 43.10% 42.00% [4] 41.30% [4]  
Operating Income (Loss) $ 9,218 $ 10,476 $ 20,541 [4] $ 19,852 [4]  
Total Assets [1] $ 146,863   $ 146,863   $ 141,602
[1] Total assets do not include intercompany receivable or payable activity between institutions and corporate and investments in subsidiaries.
[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] 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.