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Financial Instruments (Interest Rate Swaps) - Additional Information (Detail) - Interest Rate Swap [Member] | 6 Months Ended
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Jun. 30, 2019 USD ($)
Schedule Of Available For Sale Securities [Line Items] |
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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- Definition Type of interest rate paid on derivative swap. + References No definition available. + Details
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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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