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Benefit Plans - Summary of Defined Benefit Plan, Plan Assets, Category (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | $ 4,756 | $ 4,089
Common stock |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 1,562 | 1,748
Mutual funds |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 2,202 | 856
Corporate/government bonds |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 982 | 1,473
Cash and cash equivalents |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 10 | 12
Fair Value, Recurring [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 4,756 | 4,089
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 3,764 | 2,604
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 992 | 1,485
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 0 | 0
Fair Value, Recurring [Member] | Common stock |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 1,562 | 1,748
Fair Value, Recurring [Member] | Common stock | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 1,562 | 1,748
Fair Value, Recurring [Member] | Common stock | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 0 | 0
Fair Value, Recurring [Member] | Common stock | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 0 | 0
Fair Value, Recurring [Member] | Mutual funds |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 2,202 | 856
Fair Value, Recurring [Member] | Mutual funds | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 2,202 | 856
Fair Value, Recurring [Member] | Mutual funds | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 0 | 0
Fair Value, Recurring [Member] | Mutual funds | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 0 | 0
Fair Value, Recurring [Member] | Corporate/government bonds |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 982 | 1,473
Fair Value, Recurring [Member] | Corporate/government bonds | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 0 | 0
Fair Value, Recurring [Member] | Corporate/government bonds | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 982 | 1,473
Fair Value, Recurring [Member] | Corporate/government bonds | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 0 | 0
Fair Value, Recurring [Member] | Cash and cash equivalents |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 10 | 12
Fair Value, Recurring [Member] | Cash and cash equivalents | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 0 | 0
Fair Value, Recurring [Member] | Cash and cash equivalents | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | 10 | 12
Fair Value, Recurring [Member] | Cash and cash equivalents | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Fair Value | $ 0 | $ 0

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