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Employee Benefit Plans - Schedule of Defined Benefit Plan Assets (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 8,152
Defined benefit plan assets, percentage 100.00%
Cash [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 561
Defined benefit plan assets, percentage 7.00%
Debt Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 5,242
Defined benefit plan assets, percentage 64.00%
Equity Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 1,367
Defined benefit plan assets, percentage 17.00%
Other [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 982
Defined benefit plan assets, percentage 12.00%