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Financial Instruments (Interest Rate Swaps) - Additional Information (Detail) - Interest Rate Swap [Member] - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items] |  |
Fair value hedging instruments | $ 0 | $ 0
Interest rate swap, description of interest received | interest that varies with the one-month LIBOR |
Derivative, Type of Interest Rate Paid on Swap | fixed |
October 2020 [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value | $ 25,000,000 |
Interest rate swap, fixed interest rate | 1.30% |
February 2021 [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value | $ 10,000,000 |
Interest rate swap, fixed interest rate | 1.12% |
May 2022 [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value | $ 20,000,000 |
Interest rate swap, fixed interest rate | 1.77% |
June 2023 [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value | $ 15,000,000 |
Interest rate swap, fixed interest rate | 2.64% |

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