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Financial Instruments (Bonds) - Additional Information (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Derivatives Fair Value [Line Items] |  |
Corporate and municipal bonds | $ 52,600,000 | $ 49,500,000
Maturity dates of bonds, start date | 2018-07 |
Maturity dates of bonds, end date | 2023-11 |
Interest Rate Swap [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional value | $ 15,000,000 |
Interest rate swap, fixed interest rate | 1.155% |
Interest rate swap, description of interest received | interest that varies with the one-month LIBOR |
Derivative, Type of Interest Rate Paid on Swap | fixed |
Interest Rate Swap [Member] | October 2020 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional value | $ 25,000,000 |
Interest rate swap, fixed interest rate | 1.30% |
Interest Rate Swap [Member] | February 2021 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional value | $ 10,000,000 |
Interest rate swap, fixed interest rate | 1.12% |
Interest Rate Swap [Member] | May 2022 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional value | $ 20,000,000 |
Interest rate swap, fixed interest rate | 1.77% |
Interest Rate Swap [Member] | June 2023 [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional value | $ 15,000,000 |
Interest rate swap, fixed interest rate | 2.64% |

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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 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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