v3.26.1
FAIR VALUE MEASUREMENT - Summary of assets measured at fair value on a recurring basis (Detail) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-short term investment ¥ 2,212,717 ¥ 985,642
Available-for-sale debt investments-Long term investment 337,494 863,625
Available-for-sale debt investments    
Unrealized gains 72,485 59,241
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-Total 3,011,391 2,621,054
Investments Elected Measure At Fair Value [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments elected measure at fair value 249,033 712,672
Unrealized gain 36,838 12,860
Investments Elected Measure At Fair Value [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments elected measure at fair value 212,147 59,115
Available-for-sale Investments [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments 2,550,211 1,849,267
Available-for-sale debt investments    
Original cost 2,477,726 1,790,026
Unrealized gains 72,485 59,241
Unrealized loss 0 0
Provision for decline in value 0 0
Available-for-sale Investments [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-short term investment 2,212,717 985,642
Available-for-sale debt investments    
Original cost 2,147,254 966,011
Unrealized gains 65,463 19,631
Unrealized loss 0 0
Provision for decline in value 0 0
Available-for-sale Investments [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-Long term investment 337,494 863,625
Available-for-sale debt investments    
Original cost 330,472 824,015
Unrealized gains 7,022 39,610
Unrealized loss 0 0
Provision for decline in value 0 0
Quoted Prices in Active Market for Identical Assets [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-Total 0 202,635
Quoted Prices in Active Market for Identical Assets [Member] | Investments Elected Measure At Fair Value [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments elected measure at fair value 0 0
Quoted Prices in Active Market for Identical Assets [Member] | Investments Elected Measure At Fair Value [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments elected measure at fair value 0 0
Quoted Prices in Active Market for Identical Assets [Member] | Available-for-sale Investments [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-short term investment 0 202,635
Quoted Prices in Active Market for Identical Assets [Member] | Available-for-sale Investments [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-Long term investment 0 0
Significant Other Observable Inputs [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-Total 2,199,662 2,418,419
Significant Other Observable Inputs [Member] | Investments Elected Measure At Fair Value [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments elected measure at fair value 0 712,672
Significant Other Observable Inputs [Member] | Investments Elected Measure At Fair Value [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments elected measure at fair value 0 59,115
Significant Other Observable Inputs [Member] | Available-for-sale Investments [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-short term investment 2,137,269 783,007
Significant Other Observable Inputs [Member] | Available-for-sale Investments [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-Long term investment 62,393 863,625
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-Total 811,729 0
Significant Unobservable Inputs (Level 3) [Member] | Investments Elected Measure At Fair Value [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments elected measure at fair value 249,033 0
Significant Unobservable Inputs (Level 3) [Member] | Investments Elected Measure At Fair Value [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments elected measure at fair value 212,147 0
Significant Unobservable Inputs (Level 3) [Member] | Available-for-sale Investments [Member] | Fair Value, Recurring [Member] | Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-short term investment 75,448 0
Significant Unobservable Inputs (Level 3) [Member] | Available-for-sale Investments [Member] | Fair Value, Recurring [Member] | Long-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt investments-Long term investment ¥ 275,101 ¥ 0