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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.