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Employee Benefit Plans - Schedule of Defined Benefit Plan Assets (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 7,672
Defined benefit plan assets, percentage 100.00%
Cash [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 948
Defined benefit plan assets, percentage 12.00%
Debt Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 4,105
Defined benefit plan assets, percentage 54.00%
Equity Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 1,630
Defined benefit plan assets, percentage 21.00%
Other [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan assets, amount $ 989
Defined benefit plan assets, percentage 13.00%