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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.

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