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Leases - Summary of Additional Information About Company's Operating Leases (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Lease assets $ 27,116 $ 26,438
Lease liabilities 29,201 $ 28,470
Accounting Standards Update 2016-02 [Member]    
Lease assets 24,100  
Lease liabilities $ 24,100