v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Customer
Segment
Dec. 31, 2024
CNY (¥)
Customer
Dec. 31, 2023
CNY (¥)
Customer
Dec. 31, 2025
USD ($)
Summary of Significant Accounting Policies [Line Items]        
Convenience translation rate of USD1.00 6.9931     6.9931
Term deposits ¥ 247,038,000 ¥ 146,928,000    
Impairment loss on intangible assets ¥ 582,000 ¥ 0 ¥ 0  
Impairment, intangible asset, finite-lived, statement of income or comprehensive income [extensible enumeration] General and Administrative Expense General and Administrative Expense General and Administrative Expense  
Remaining performance obligations ¥ 2,565,942,000      
Remaining performance obligations, expected to be recognized over the next 12 months 2,289,322,000      
Remaining performance obligations, expected to be recognized over the second 12 months 169,403,000      
Remaining performance obligations, expected to be recognized thereafter 107,217,000      
Government subsidies 30,125,000 ¥ 34,906,000 ¥ 6,469,000  
Cash and cash equivalents ¥ 596,195,000 ¥ 1,321,118,000   $ 85,255
Concentration Risk, Percentage 10.00% 10.00% 10.00%  
Available-for-sale debt investments recorded with unrealized gain ¥ 72,485,000 ¥ 59,241,000    
Impairment loss on investments 0 0 ¥ 0  
Goodwill impairment loss 0 0 0  
Contract costs ¥ 0 0    
Uncertain income tax position An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. Interest and penalties on income taxes are classified as a component of the provisions for income taxes.      
Number of reportable segments | Segment 1      
Total advertising expenses ¥ 1,693,744,000 ¥ 1,565,549,000 ¥ 775,234,000  
Change in accounting principle accounting standards update adopted true     true
Change in accounting principle accounting standards update adoption date Jan. 01, 2025     Jan. 01, 2025
Accounting standards update [extensible enumeration] us-gaap:AccountingStandardsUpdate202309Member      
Change in accounting principle, accounting standards update, immaterial effect [true false] true     true
Maximum [Member]        
Summary of Significant Accounting Policies [Line Items]        
Operating Lease, Term 7 years     7 years
Small Scale VAT Payer Entities [Member] | Educational services [Member]        
Summary of Significant Accounting Policies [Line Items]        
Value added tax rate 3.00%     3.00%
Small Scale VAT Payer Entities [Member] | Revenue on Sales [Member]        
Summary of Significant Accounting Policies [Line Items]        
Value added tax rate 3.00%     3.00%
Simple VAT Collection [Member] | Non-academic Education Services [Member]        
Summary of Significant Accounting Policies [Line Items]        
Value added tax rate 3.00%     3.00%
General VAT Payer Entities [Member] | Educational services [Member]        
Summary of Significant Accounting Policies [Line Items]        
Value added tax rate 6.00%     6.00%
General VAT Payer Entities [Member] | Non-academic Education Services [Member] | Subsidiaries [Member]        
Summary of Significant Accounting Policies [Line Items]        
Value added tax rate 3.00%     3.00%
General VAT Payer Entities [Member] | Revenue on Sales [Member]        
Summary of Significant Accounting Policies [Line Items]        
Value added tax rate 13.00%     13.00%
Revenue Benchmark        
Summary of Significant Accounting Policies [Line Items]        
Number of customers whose revenue individually represent greater than 10% of the total net revenues | Customer 0 0 0  
CNY        
Summary of Significant Accounting Policies [Line Items]        
Cash and cash equivalents ¥ 671,515,000 ¥ 1,057,129,000