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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | $ 59,625 | $ 56,790
Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 59,095 | 56,209
Accrued income | 530 | 581
Total fair value of plan assets | 59,625 | 56,790
Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 6,569 | 6,345
Accrued income | 530 | 581
Total fair value of plan assets | 7,099 | 6,926
Level 2 | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 52,526 | 49,864
Total fair value of plan assets | 52,526 | 49,864
US Government Agencies Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 5,870 | 4,044
US Government Agencies Debt Securities | Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 5,870 | 4,044
Collateralized mortgage securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 765 |
Collateralized mortgage securities | Level 2 | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 765 |
Corporate Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 47,839 | 47,667
Corporate Debt Securities | Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 684
Corporate Debt Securities | Level 2 | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 47,839 | 46,983
Cash and Cash Equivalents | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 2,526 | 1,214
Cash and Cash Equivalents | Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets |  | 717
Cash and Cash Equivalents | Level 2 | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 2,526 | 497
Other | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,396 | 2,384
Other | Level 2 | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,396 | 2,384
Equity Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 699 | 900
Equity Securities | Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | $ 699 | $ 900

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