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Retirement Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution retirement plan voluntary contributions | $ 18,000 |
Retirement benefit obligations discount rate | 3.33% | 3.76%
Expected actuarial losses included in accumulated other comprehensive loss in net periodic benefit cost in 2018 | $ 119,000 |
Former Executives |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Retirement benefit obligations | 7,300,000 | $ 6,900,000
Employees 50 years or over |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined contribution retirement plan voluntary contributions | $ 24,000 |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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