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Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Revenue $ 170,994 $ 157,853  
Percentage of total revenue 100.00% 100.00%  
Operating Income (Loss) $ 37,303 $ 29,971  
Total Assets [1] 606,526   $ 599,146
Discontinued Operations [Member]      
Segment Reporting Information [Line Items]      
Total Assets [1] 81   81
University Group [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 170,984 $ 157,836  
Percentage of total revenue 100.00% 100.00%  
Operating Income (Loss) $ 43,995 $ 38,003  
Total Assets [1] 245,549   205,161
Corporate and Other [Member]      
Segment Reporting Information [Line Items]      
Revenue [2],[3] 10 17  
Operating Income (Loss) [2] (6,692) (8,032)  
Total Assets [1],[2] 360,896   393,904
CTU [Member] | University Group [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 103,588 $ 97,057  
Percentage of total revenue 60.60% 61.50%  
Operating Income (Loss) $ 34,619 $ 29,691  
Total Assets [1] 100,566   100,414
AIU [Member] | University Group [Member]      
Segment Reporting Information [Line Items]      
Revenue [5] $ 67,396 [4] $ 60,779  
Percentage of total revenue [5] 39.40% 38.50%  
Operating Income (Loss) [5] $ 9,376 $ 8,312  
Total Assets [1],[5] $ 144,983   $ 104,747
[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 certain bookstore sales and closed campuses which are now reported within this category.
[4] AIU includes revenue related to the Trident acquisition commencing on the March 2, 2020 date of acquisition.
[5] AIU results of operations and total assets include the Trident acquisition commencing on the March 2, 2020 date of acquisition and as of March 31, 2020.