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Pension and Employee Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Current Assets Mix percentage | 100.00% | 100.00% |
Assumed average annual returns | 5.75% | 7.25% | 7.50%
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 | 1,400,000 | $ 2,000,000 | $ 2,100,000
Aggregate matching contributions and discretionary contributions Amount | $ 1,700,000 | $ 1,600,000 | $ 1,500,000
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 |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Plans Funded Status Description | Between 65 and less than 80 percent |  |
Red Zone |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Plans Funded Status Description | Less than 65 percent |  |
Green Zone |  |  |
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] |  |  |
Net loss for the defined benefit pension plan to be amortized in next year | $ 200,000 |  |
Estimated pension plan cash obligations payable in 2019 | 2,100,000 |  |
Estimated pension plan cash obligations payable in 2020 | 2,100,000 |  |
Estimated pension plan cash obligations payable in 2021 | 2,100,000 |  |
Estimated pension plan cash obligations payable in 2022 | 2,100,000 |  |
Estimated pension plan cash obligations payable in 2023 | 2,100,000 |  |
Estimated pension plan cash obligations payable in 2024 through 2028 | 10,500,000 |  |
Health Care Plan [Member] |  |  |
Defined Benefit And Contribution Plan Disclosure [Line Items] |  |  |
Net loss for the defined benefit pension plan to be amortized in next year | $ 0 |  |
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan 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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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of accumulated benefit obligation attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947 + Details
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- Definition Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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