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Financial Instruments (Interest Rate Swaps) - Additional Information (Detail) - Interest Rate Swap [Member] | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 USD ($) Swap | Jun. 26, 2020 USD ($)
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value | $ 50,000,000 | $ 25,000,000
Interest rate swap, fixed interest rate | 0.885% | 1.30%
Interest rate swap, description of interest received | interest that varies with the one-month LIBOR |
Derivative, Type of Interest Rate Paid on Swap | fixed |
Number of interest rate swaps outstanding | Swap | 4 |
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% |
April 2025 [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value | $ 50,000,000 |
Interest rate swap, fixed interest rate | 0.885% |

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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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