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Fair Value Measurements - Changes in Level 3 Assets Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at the beginning of the year $ 320 $ 12,869
Transfers (to)/from level 2   (12,714)
Purchases 255 240
Settlements (110) (75)
Total unrealized losses (11)  
Balance at the end of the period $ 454 $ 320