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Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value Disclosures [Abstract]        
Beginning balance $ 1,235 $ 0 $ 0 $ 0
Included in accumulated other comprehensive income 66 0 34 0
Transfers into level 3 96 0 798 0
Transfers out of level 3 0 0 (1,720) 0
Amortization of bond premium and discount, net 1 0 1 0
Purchases 201 0 2,486 0
Sales (61) 0 (61) 0
Ending balance $ 1,538 $ 0 $ 1,538 $ 0