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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance |  | $ 113,585 | $ 90,785 | $ 61,291 | $ 63,970
Revenue earned from prior balances |  | (100,980) | (76,801) | (55,302) | (58,553)
Billings during period | [1] | 222,122 | 160,127 | 694,863 | 519,268
Revenue earned for new billings during the period |  | (109,694) | (91,641) | (575,595) | (442,291)
Other adjustments |  | (113) | (263) | (337) | (187)
Gross deferred revenue, ending balance |  | 124,920 | 82,207 | 124,920 | 82,207
University Group [Member] | CTU [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance | [2] | 64,396 | 61,297 | 33,168 | 36,409
Revenue earned from prior balances | [2] | (59,163) | (54,925) | (29,825) | (32,389)
Billings during period | [1],[2] | 101,912 | 97,256 | 361,969 | 340,676
Revenue earned for new billings during the period | [2] | (57,148) | (56,454) | (315,551) | (297,242)
Other adjustments | [2] | (524) | (152) | (288) | (432)
Gross deferred revenue, ending balance | [2] | 49,473 | 47,022 | 49,473 | 47,022
University Group [Member] | AIUS [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance | [2] | 22,716 | 29,488 | 26,555 | 27,561
Revenue earned from prior balances | [2] | (16,104) | (21,876) | (25,022) | (26,164)
Billings during period | [1],[2] | 64,006 | 62,871 | 175,160 | 178,592
Revenue earned for new billings during the period | [2] | (40,290) | (35,187) | (146,654) | (145,049)
Other adjustments | [2] | (322) | (111) | (33) | 245
Gross deferred revenue, ending balance | [2] | 30,006 | $ 35,185 | 30,006 | $ 35,185
University Group [Member] | USAHS [Member] |  |  |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |  |  |
Gross deferred revenue, beginning balance | [3] | 26,473 |  | 1,568 |
Revenue earned from prior balances | [3] | (25,713) |  | (455) |
Billings during period | [1],[3] | 56,204 |  | 157,734 |
Revenue earned for new billings during the period | [3] | (12,256) |  | (113,390) |
Other adjustments | [3] | 733 |  | (16) |
Gross deferred revenue, ending balance | [3] | $ 45,441 |  | $ 45,441 |
[1] | Billings during period includes adjustments for prior billings.
[2] | The prior period amounts for CTU and AIUS were recast to reflect the transition of the Hippo Education institution from CTU to AIUS.
[3] | USAHS includes deferred revenue starting from the acquisition date on December 2, 2024.

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