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