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Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | $ 169,126 |  | $ 154,959 | $ 516,155 |  | $ 469,253 |  |
Percentage of total revenue |  | 100.00% |  | 100.00% | 100.00% |  | 100.00% |  |
Operating Income (Loss) |  | $ 32,074 |  | $ 24,294 | $ 106,745 |  | $ 54,449 |  |
Total Assets | [1] | 683,751 |  |  | 683,751 |  |  |  | $ 599,146
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Total Assets | [1] | 81 |  |  | 81 |  |  |  | 81
University Group [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | $ 169,033 |  | $ 154,945 | $ 516,045 |  | $ 469,209 |  |
Percentage of total revenue |  | 99.90% |  | 100.00% | 100.00% |  | 100.00% |  |
Operating Income (Loss) |  | $ 38,506 |  | $ 37,267 | $ 126,053 |  | $ 83,166 |  |
Total Assets | [1] | 234,433 |  |  | 234,433 |  |  |  | 205,161
Corporate and Other [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue | [2],[3] | 93 |  | 14 | 110 |  | $ 44 |  |
Percentage of total revenue | [2] |  |  |  |  |  | 0.00% |  |
Operating Income (Loss) | [2] | (6,432) |  | (12,973) | (19,308) |  | $ (28,717) |  |
Total Assets | [1],[2] | 449,237 |  |  | 449,237 |  |  |  | 393,904
CTU [Member] | University Group [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue |  | $ 98,985 |  | $ 96,038 | $ 302,766 | [4] | $ 289,650 | [4] |
Percentage of total revenue |  | 58.50% |  | 62.00% | 58.70% | [4] | 61.70% | [4] |
Operating Income (Loss) |  | $ 32,993 |  | $ 29,926 | $ 100,688 | [4] | $ 71,730 | [4] |
Total Assets | [1] | 98,220 |  |  | 98,220 |  |  |  | 100,414
AIU [Member] | University Group [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenue | [5] | $ 70,048 | [6] | $ 58,907 | $ 213,279 | [6],[7] | $ 179,559 | [7] |
Percentage of total revenue | [5] | 41.40% |  | 38.00% | 41.30% | [7] | 38.30% | [7] |
Operating Income (Loss) | [5] | $ 5,513 |  | $ 7,341 | $ 25,365 | [7] | $ 11,436 | [7] |
Total Assets | [1],[5] | $ 136,213 |  |  | $ 136,213 |  |  |  | $ 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. An expense of $7.1 million was recorded for closed campuses related to the Oregon arbitration matter for the quarter and year to date ended September 30, 2019
[3] | Revenue recorded within Corporate and Other relates to certain bookstore sales and closed campuses which are now reported within this category as well as revenue not related to campus operations.
[4] | An expense of $18.6 million was recorded within CTU related to the FTC settlement for the year to date ended September 30, 2019.
[5] | AIU results of operations and total assets include the Trident acquisition commencing on the March 2, 2020 date of acquisition and as of September 3 0, 2020.
[6] | AIU includes revenue related to the Trident acquisition commencing on the March 2, 2020 date of acquisition.
[7] | An expense of $11.4 million was recorded within AIU related to the FTC settlement for the year to date ended September 30, 2019.

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