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Revenue Recognition - Summary of Disaggregation of Revenue by Major Source (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | [1] | Sep. 30, 2020 | [1] | Jun. 30, 2020 | [1] | Mar. 31, 2020 | [1] | Dec. 31, 2019 | Sep. 30, 2019 | [2] | Jun. 30, 2019 | [3] | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 171,159 | $ 169,126 | $ 176,035 | $ 170,994 | $ 158,451 | $ 154,959 | $ 156,441 | $ 157,853 | $ 687,314 |  | $ 627,704 |  | $ 581,296 |
Tuition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 651,801 |  | 595,682 |  | 557,191 |
Technology Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 30,809 |  | 27,256 |  | 19,150 |
Other Miscellaneous Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [4] |  |  |  |  |  |  |  |  | 1,969 |  | 2,118 |  | 2,204 |
Tuition and Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 684,579 |  | 625,056 |  | 578,545 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [5] |  |  |  |  |  |  |  |  | 2,735 |  | 2,648 |  | 2,751 |
University Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 686,868 |  | 627,637 |  | 580,690 |
University Group [Member] | CTU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 405,507 |  | 392,263 | [6] | 375,770 |
University Group [Member] | AIU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 281,361 | [7],[8] | 235,374 | [9] | 204,920 |
University Group [Member] | Tuition [Member] | CTU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 381,371 |  | 370,318 |  | 359,929 |
University Group [Member] | Tuition [Member] | AIU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 270,430 | [7] | 225,364 |  | 196,712 |
University Group [Member] | Technology Fees [Member] | CTU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 20,687 |  | 17,844 |  | 11,560 |
University Group [Member] | Technology Fees [Member] | AIU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 10,122 | [7] | 9,412 |  | 7,590 |
University Group [Member] | Other Miscellaneous Fees [Member] | CTU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [4] |  |  |  |  |  |  |  |  | 1,283 |  | 1,690 |  | 1,769 |
University Group [Member] | Other Miscellaneous Fees [Member] | AIU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [4] |  |  |  |  |  |  |  |  | 686 | [7] | 428 |  | 416 |
University Group [Member] | Tuition and Fees [Member] | CTU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 403,341 |  | 389,852 |  | 373,258 |
University Group [Member] | Tuition and Fees [Member] | AIU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 281,238 | [7] | 235,204 |  | 204,718 |
University Group [Member] | Other [Member] | CTU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [5] |  |  |  |  |  |  |  |  | 2,166 |  | 2,411 |  | 2,512 |
University Group [Member] | Other [Member] | AIU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [5] |  |  |  |  |  |  |  |  | 123 | [7] | 170 |  | 202 |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [10] |  |  |  |  |  |  |  |  | 446 |  | 67 | [11] | 606 | [12]
Corporate and Other [Member] | Tuition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [10] |  |  |  |  |  |  |  |  |  |  |  |  | 550 |
Corporate and Other [Member] | Other Miscellaneous Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [4],[10] |  |  |  |  |  |  |  |  |  |  |  |  | 19 |
Corporate and Other [Member] | Tuition and Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [10] |  |  |  |  |  |  |  |  |  |  |  |  | 569 |
Corporate and Other [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [5],[10] |  |  |  |  |  |  |  |  | $ 446 |  | $ 67 |  | $ 37 |
[1] | 2020 results include the Trident acquisition commencing on the March 2, 2020 date of acquisition.
[2] | Third quarter of 2019 net income included a $7.1 million significant legal settlement for the Oregon arbitration matter.
[3] | Second quarter of 2019 net income included a $30.0 million significant legal settlement for the FTC matter, of which $23.3 million was non-deductible for income tax purposes during the second quarter of 2019.
[4] | Other miscellaneous fees include student activity fees and graduation fees.
[5] | Other revenue primarily includes contract training revenue and bookstore sales.
[6] | CTU: a $18.6 million charge related to the FTC settlement.
[7] | AIU includes revenue related to the Trident acquisition commencing on the March 2, 2020 date of acquisition.
[8] | AIU results of operations and total assets include the Trident acquisition commencing on the March 2, 2020 date of acquisition and as of December 31, 2020.
[9] | AIU: a $11.4 million charge related to the FTC settlement.
[10] | 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.
[11] | Corporate and Other: a $7.1 million charge related to the Oregon arbitration matter for closed campuses.
[12] | Corporate and Other: $14.6 million of charges related to significant legal settlements for the Surrett and multi-state AG matters and $9.4 million of charges related to remaining lease obligations for vacated space.

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