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Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs Level Three (Detail) - Available-for-sale Securities - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Marketable Securities - Debt Securities    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance at beginning of year $ 10,000  
Purchase   $ 10,000
Balance at end of year   10,000
Marketable Securities - Debt and Equity Securities    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance at beginning of year 10,000  
Purchase 2,190  
Disposal (2,033)  
Balance at end of year 10,322 10,000
Unrealized Gain (Loss) on Security | Marketable Securities - Debt Securities    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Total gains or (losses) (realized/unrealized), included in other comprehensive income   (351)
Unrealized Gain (Loss) on Security | Marketable Securities - Debt and Equity Securities    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Total gains or (losses) (realized/unrealized), included in other comprehensive income (124)  
Foreign Currency Items | Marketable Securities - Debt Securities    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Total gains or (losses) (realized/unrealized), included in other comprehensive income   $ 351
Foreign Currency Items | Marketable Securities - Debt and Equity Securities    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Total gains or (losses) (realized/unrealized), included in other comprehensive income $ 289