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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, 2023
Dec. 31, 2022
Investment in Debt Securities    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance at beginning of year $ 7,950 $ 8,132
Purchase 105  
Disposal or repayment (1,000)  
Balance at end of year 5,548 7,950
Investment in Equity Securities    
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance at beginning of year 2,371 2,190
Total gains or (losses) (realized/unrealized), included in earnings $ (2,110) $ 409
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Debt Securities, Available-for-Sale, Gain (Loss) Debt Securities, Available-for-Sale, Gain (Loss)
Balance at end of year $ 229 $ 2,371
The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date. (2,110) 409
Unrealized Gain (Loss) on Security | Investment in 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 $ (1,453) $ 620
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax
Foreign Currency Items | Investment in 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 $ (54) $ (802)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Foreign Currency Items | Investment in 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 $ (32) $ (228)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax