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Segment Reporting - Summary Financial Information by Reporting Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 148,065 | $ 162,109 |
Percentage of total revenue |  | 100.00% | 100.00% |
Operating Income (Loss) |  | $ 20,529 | $ 9,781 |
Total Assets | [1] | 457,336 |  | $ 447,096
Discontinued Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Assets | [1] | 2,098 |  | 1,967
University Group [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 147,728 | $ 148,288 |
Percentage of total revenue |  | 99.80% | 91.50% |
Operating Income (Loss) |  | $ 31,321 | $ 27,676 |
Total Assets | [1] | 131,043 |  | 124,820
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) |  | (4,542) | (4,549) |
Total Assets | [1] | 296,136 |  | 291,211
Subtotal [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 147,728 | $ 148,288 |
Percentage of total revenue |  | 99.80% | 91.50% |
Operating Income (Loss) |  | $ 26,779 | $ 23,127 |
Total Assets | [1] | 427,179 |  | 416,031
All Other Campuses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 337 | $ 13,821 |
Percentage of total revenue |  | 0.20% | 8.50% |
Operating Income (Loss) |  | $ (6,250) | $ (13,346) |
Total Assets | [1] | 28,059 |  | 29,098
CTU [Member] | University Group [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 94,607 | $ 94,035 |
Percentage of total revenue |  | 63.90% | 58.00% |
Operating Income (Loss) |  | $ 27,185 | $ 23,020 |
Total Assets | [1] | 76,070 |  | 72,988
AIU [Member] | University Group [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue |  | $ 53,121 | $ 54,253 |
Percentage of total revenue |  | 35.90% | 33.50% |
Operating Income (Loss) |  | $ 4,136 | $ 4,656 |
Total Assets | [1] | $ 54,973 |  | $ 51,832
[1] | Total assets do not include intercompany receivable or payable activity between schools and corporate and investments in subsidiaries.

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