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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | $ 63,204 | $ 51,694
Business acquisition, beginning balance |  | 13,395 |
Revenue earned from prior balances |  | (56,667) | (44,005)
Billings during period | [1] | 149,692 | 140,549
Revenue earned for new billings during the period |  | (113,727) | (113,223)
Other adjustments |  | 1,023 | 1,066
Gross deferred revenue, ending balance |  | 56,920 | 36,081
University Group [Member] | CTU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 27,845 | 24,250
Revenue earned from prior balances |  | (25,149) | (22,344)
Billings during period | [1] | 103,044 | 97,516
Revenue earned for new billings during the period |  | (77,894) | (74,147)
Other adjustments |  | 140 | 626
Gross deferred revenue, ending balance |  | 27,986 | 25,901
University Group [Member] | AIU [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Gross deferred revenue, beginning balance |  | 35,359 | 27,444
Business acquisition, beginning balance |  | 13,395 |
Revenue earned from prior balances |  | (31,518) | (21,661)
Billings during period | [1] | 46,648 | 43,033
Revenue earned for new billings during the period |  | (35,833) | (39,076)
Other adjustments |  | 883 | 440
Gross deferred revenue, ending balance |  | $ 28,934 | $ 10,180
[1] | Billings during period includes adjustments for prior billings.

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- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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