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Employee Benefit Plans - Schedule of Defined Benefit Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan assets, amount $ 11,093 $ 7,822
Defined benefit plan assets, percentage 100.00% 100.00%
Cash [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan assets, amount $ 430 $ 193
Defined benefit plan assets, percentage 4.00% 2.00%
Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan assets, amount $ 8,023 $ 4,855
Defined benefit plan assets, percentage 72.00% 62.00%
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan assets, amount $ 1,519 $ 1,342
Defined benefit plan assets, percentage 14.00% 17.00%
Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan assets, amount $ 1,121 $ 1,432
Defined benefit plan assets, percentage 10.00% 19.00%