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Summary of Significant Unobservable Inputs Used in Fair Value Measurements Categorized Within Level 3 of Fair Value Hierarchy (Detail) - Level 3 - Option Pricing Method
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Rate for Debt Investment | Discount Rate for Future Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount rate for future cash flows 38.5  
Rate for Debt Investment | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility   36.0
Rate for Debt Investment | Minimum | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”) 4.0 9.0
Rate for Debt Investment | Minimum | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility 28  
Rate for Debt Investment | Maximum | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”) 12.0 18.0
Rate for Debt Investment | Maximum | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility 31.0  
Rate for Equity Investment | Discount Rate for Future Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount rate for future cash flows 38.5  
Rate for Equity Investment | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility   36.0
Rate for Equity Investment | Minimum | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”) 6.0 11.0
Rate for Equity Investment | Minimum | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility 28  
Rate for Equity Investment | Maximum | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Discount for lack of marketability (“DLOM”) 12.0 18.0
Rate for Equity Investment | Maximum | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Volatility 31.0  
Debt Securities | Discount Rate for Future Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% $ 372  
Changes of Fair Value, If the Rate of Input changes by +1% 262  
Debt Securities | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 93 $ 93
Changes of Fair Value, If the Rate of Input changes by +1% (93) 92
Debt Securities | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 23 (9)
Changes of Fair Value, If the Rate of Input changes by +1% 24 2
Equity Securities | Discount Rate for Future Cash Flows    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 175  
Changes of Fair Value, If the Rate of Input changes by +1% 170  
Equity Securities | Discount for Lack of Marketability (“DLOM”)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 26 26
Changes of Fair Value, If the Rate of Input changes by +1% (25) (26)
Equity Securities | Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Changes of Fair Value, If the Rate of Input changes by -1% 16 13
Changes of Fair Value, If the Rate of Input changes by +1% $ (10) $ (12)