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Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Revenue $ 169,828 $ 179,923 $ 504,832 $ 562,085  
Percentage of total revenue 100.00% 100.00% 100.00% 100.00%  
Operating Income (Loss) $ 44,794 $ 43,073 $ 137,078 $ 134,503  
Total Assets [1] 1,116,756   1,116,756   $ 1,007,316
Corporate and Other [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 199 $ 145 $ 579 $ 621  
Percentage of total revenue 0.10% 0.10% 0.10% 0.10%  
Operating Income (Loss) $ (8,468) $ (7,020) $ (23,442) $ (28,812)  
Total Assets [1] 732,293   732,293   643,252
CTU [Member] | University Group [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 115,742 $ 120,552 $ 342,139 $ 364,336  
Percentage of total revenue 68.20% 67.00% 67.80% 64.80%  
Operating Income (Loss) $ 44,199 $ 34,491 $ 129,245 $ 118,632  
Total Assets [1] 212,523   212,523   202,728
AIUS [Member] | University Group [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 53,887 $ 59,226 $ 162,114 $ 197,128  
Percentage of total revenue 31.70% 32.90% 32.10% 35.10%  
Operating Income (Loss) $ 9,063 $ 15,602 $ 31,275 $ 44,683  
Total Assets [1] $ 171,940   $ 171,940   $ 161,336
[1] Total assets are presented on a condensed consolidated basis and do not include intercompany receivable or payable activity between institutions and corporate and investments in subsidiaries.