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Employee Benefit Plans - Schedule of Defined Benefit Plan Assets (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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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%

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