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Pension, Other Postretirement Benefits and Employee Savings and Investment Plans (Additional Information) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Projected benefit obligation of plan with accumulated benefit obligation in excess of plan assets |  | $ 200,000 | $ 155,800,000 |
Accumulated benefit obligation of plan with accumulated benefit obligation in excess of plan assets |  | 200,000 | 155,800,000 |
Fair value of the plan assets of plan with accumulated benefit obligation in excess of plan assets |  | 0 | 147,100,000 |
Projected benefit obligation of plan with plan assets in excess of accumulated benefit obligation |  | 172,400,000 | 30,000,000 |
Accumulated benefit obligation of plan with plan assets in excess of accumulated benefit obligation |  | 172,400,000 | 30,000,000 |
Fair value of the plan assets of plan with plan assets in excess of accumulated benefit obligation |  | $ 191,700,000 | 33,000,000 |
Health care cost, employees age |  | 65 years |  |
Health care cost trend rate annual change |  | 0.25% |  |
Percentage point change in assumed health care cost trend rates |  | 1.00% |  |
Historical return on plan assets over 20 years |  | 7.05% |  |
Anticipated payment for defined benefit pensions | $ 25,000,000 | $ 25,354,000 | $ 906,000 | $ 842,000
Document Fiscal Year Focus |  | 2018 |  |
Retirees of 65 Years Old or Younger |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Health care cost trend rate assumed for next fiscal year |  | 7.00% | 7.25% |
Ultimate health care cost trend rate |  | 4.50% |  |
Retirees of 65 Years Old or Older |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Health care cost trend rate assumed for next fiscal year |  | 7.00% | 7.25% |
Ultimate health care cost trend rate |  | 4.50% |  |
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net loss to be recognized over next twelve months |  | $ 1,800,000 |  |
Expected long-term rate of return on plan assets |  | 4.69% |  |
Required employer contribution |  |  | $ 400,000 |
Employer contributions |  | $ 25,000,000 | $ 372,000 |
Pension Benefits | Equity Securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Plan asset allocations |  | 1.00% | 4.00% |
Pension Benefits | Debt Securities |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Plan asset allocations |  | 99.00% | 96.00% |
Retirement Health and Life Insurance Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Net loss to be recognized over next twelve months |  | $ 1,000,000 |  |
Employer contributions |  | 364,000 | $ 533,000 |
Rogers Employee Savings and Investment Plan (RESIP) |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
IRS deferral limit |  | $ 18,500 |  |
Employee compensation subject to employer matching percent |  | 6.00% |  |
Employer contributions |  | $ 5,600,000 | $ 4,000,000 | $ 3,000,000
Rogers Employee Savings and Investment Plan (RESIP) | 100% match |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employee compensation subject to employer matching percent |  | 3.50% |  |
Rogers Employee Savings and Investment Plan (RESIP) | 100% match | 1% of compensation |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employee compensation subject to employer matching percent |  | 1.00% |  |
Employer matching contribution percent |  | 100.00% |  |
Rogers Employee Savings and Investment Plan (RESIP) | 50% match | 5% of compensation |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employee compensation subject to employer matching percent |  | 5.00% |  |
Employer matching contribution percent |  | 50.00% |  |
DeWAL Industries, Inc 401k Profit Sharing Plan (DeWAL Plan) |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Employee compensation subject to employer matching percent |  | 3.00% |  |
Employer matching contribution, percent of match |  | 100.00% |  |

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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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 (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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