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Financial Instruments (Interest Rate Swaps) - Additional Information (Detail) - Interest Rate Swap [Member] | 12 Months Ended |
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Dec. 31, 2018 USD ($) Interest_Rate_Swaps | Dec. 31, 2017 USD ($)
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% |
Second Quarter 2018 [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Notional value | $ 15,000,000 |
Interest rate swap, term | 5 years |
Fourth Quarter 2018 [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Number of interest rate swaps | Interest_Rate_Swaps | 1 |
Notional value | $ 15,000,000 |

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- Definition When the derivative or group of derivatives presented is a swap, the type of interest rate (fixed, variable, stepped, etc.) paid on the swap. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A -Footnote 1 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + 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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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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