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Pension and Employee Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Funded status at end of year | $ 9,700,000 | $ 8,800,000 | $ 8,800,000
Net loss | $ 3,287,000 | $ 527,000 | $ 271,000
Current Assets Mix percentage | 100.00% | 100.00% |
Assumed average annual returns | 6.00% | 5.35% | 5.75%
Listing under plans Forms 5500 as providing more than 5% contribution | false |  |
Liability has been provided in the accompanying consolidated financial statements | $ 0 |  |
Amounts charged to pension expense | 1,000,000.0 | $ 1,700,000 | $ 1,400,000
Aggregate matching contributions and discretionary contributions Amount | $ 1,600,000 | 1,700,000 | 1,700,000
Employee Deferral Category One [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Profit sharing and 401(k) savings retirement plan for non-union employees Description | The plan covers substantially all employees who have 30 days of service, and who have attained 18 years of age. |  |
Percentage of Employee salary deferral provision | 100.00% |  |
Yellow Zone [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Plans Funded Status Description | Between 65 and less than 80 percent |  |
Red Zone [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Plans Funded Status Description | Less than 65 percent |  |
Green Zone [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Plans Funded Status Description | At least 80 percent |  |
Pension Plan [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Funded status at end of year | $ (9,727,000) | $ (8,886,000) | $ (8,801,000)
Estimated pension plan cash obligations payable in 2021 | 2,200,000 |  |
Estimated pension plan cash obligations payable in 2022 | 2,200,000 |  |
Estimated pension plan cash obligations payable in 2023 | 2,200,000 |  |
Estimated pension plan cash obligations payable in 2024 | 2,200,000 |  |
Estimated pension plan cash obligations payable in 2025 | 2,200,000 |  |
Estimated pension plan cash obligations payable in 2026 through 2029 | $ 10,300,000 |  |
Minimum [Member] | Debt Securities [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 30.00% |  |
Assumed average annual returns | 4.00% |  |
Minimum [Member] | Equity Securities [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 60.00% |  |
Assumed average annual returns | 8.00% |  |
Maximum [Member] | Debt Securities [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 40.00% |  |
Assumed average annual returns | 6.00% |  |
Maximum [Member] | Equity Securities [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 70.00% |  |
Assumed average annual returns | 12.00% |  |

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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