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Retirement Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution retirement plan voluntary contributions | $ 18,500 |
Retirement benefit obligations discount rate | 3.98% | 3.33%
Expected actuarial losses included in accumulated other comprehensive loss in net periodic benefit cost in 2019 | $ 84,000 |
Former Executives |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement benefit obligations | 6,600,000 | $ 7,300,000
Employees 50 years or over |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution retirement plan voluntary contributions | $ 24,500 |

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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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