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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Additional Information) (Detail) | 2 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 01, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) plan | Dec. 31, 2018 USD ($) | Jul. 27, 2020 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Number of qualified noncontributory defined benefit plans | plan |  |  |  |  |  |  | 2 |  |
Merged plan assets | $ 12,790,000 | $ 12,790,000 | $ 12,790,000 |  |  | $ 5,278,000 | $ 12,790,000 |  |
PBO of plan assets for pension plan with plan assets in excess of its PBO | 30,000,000.0 | 30,000,000.0 | 30,000,000.0 |  |  | 30,000,000.0 | 30,000,000.0 |  |
ABO of plan assets for pension plan with plan assets in excess of its PBO | 30,000,000.0 | 30,000,000.0 | 30,000,000.0 |  |  | 30,000,000.0 | 30,000,000.0 |  |
Fair value of the plan assets for pension plan with plan assets in excess of its PBO | 42,800,000 | 42,800,000 | 42,800,000 |  |  | 35,300,000 | 42,800,000 |  |
PBO of plan assets for pension plan with plan assets in excess of its ABO | 30,000,000.0 | 30,000,000.0 | 30,000,000.0 |  |  | 30,000,000.0 | 30,000,000.0 |  |
ABO of plan assets for pension plan with plan assets in excess of its ABO | 30,000,000.0 | 30,000,000.0 | 30,000,000.0 |  |  | 30,000,000.0 | 30,000,000.0 |  |
Fair value of the plan assets for pension plan with plan assets in excess of its ABO | $ 42,800,000 | $ 42,800,000 | $ 42,800,000 |  |  | $ 35,300,000 | $ 42,800,000 |  |
Health care cost, employees age |  |  |  |  |  | 65 years | 65 years |  |
Health care cost trend rate annual change (as a percentage) |  |  |  |  |  | 0.25% |  |  |
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 (as a percentage) | 6.75% | 6.75% | 6.75% |  |  | 6.50% | 6.75% |  |
Ultimate health care cost trend rate (as a percentage) |  |  |  |  |  | 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 (as a percentage) | 6.75% | 6.75% | 6.75% |  |  | 6.50% | 6.75% |  |
Ultimate health care cost trend rate (as a percentage) |  |  |  |  |  | 4.50% |  |  |
Pension Benefits |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Annuity payments |  |  |  |  |  | $ (237,000) | $ 162,484,000 |  |
Merged plan assets | $ 12,790,000 | $ 12,790,000 | $ 12,790,000 |  |  | 5,278,000 | 12,790,000 |  |
Plan assets | $ 42,835,000 | $ 42,835,000 | $ 42,835,000 |  |  | $ 35,296,000 | 42,835,000 | $ 191,652,000 |
Expected long-term rate of return on plan assets (as a percentage) |  |  |  |  |  | 4.53% |  |  |
Employer contributions |  |  |  |  |  | $ 0 | $ 41,000 |  |
Pension Benefits | Fixed Income |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Plan asset allocations (as a percentage) | 92.00% | 92.00% | 92.00% |  |  | 90.00% | 92.00% |  |
Pension Benefits | Equity Securities |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Plan asset allocations (as a percentage) | 8.00% | 8.00% | 8.00% |  |  | 10.00% | 8.00% |  |
Other Postretirement Benefits |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Annuity payments |  |  |  |  |  | $ 0 | $ 0 |  |
Merged plan assets | $ 0 | $ 0 | $ 0 |  |  | 0 | 0 |  |
Plan assets | 0 | 0 | 0 |  |  | 0 | 0 | 0 |
PBO of plan assets for other postretirement benefit plans with ABO in excess of plan assets | 1,600,000 | 1,600,000 | 1,600,000 |  |  | 1,500,000 | 1,600,000 |  |
ABO of plan assets for other postretirement benefit plans with ABO in excess of plan assets | (1,600,000) | (1,600,000) | (1,600,000) |  |  | (1,500,000) | (1,600,000) |  |
Employer contributions |  |  |  |  |  | 192,000 | 273,000 |  |
Merged Plan |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  |  |  | 25,000,000.0 |  |
Merged Plan | Pension Benefits |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Annuity payments | $ 1,300,000 |  |  |  | $ 123,300,000 |  |  |  |
Lump sum distributions |  | $ 38,900,000 |  |  |  |  |  |  |
Non-cash pre-tax settlement charge in connection with termination of Merged Plan |  |  | $ 53,200,000 | $ 0 |  |  |  |  |
Merged plan assets |  |  |  |  |  | 9,100,000 |  |  |
Rogers Employee Savings and Investment Plan (RESIP) |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  |  | 4,900,000 | $ 4,400,000 | $ 5,600,000 |
IRS deferral limit |  |  |  |  |  | $ 19,000 |  |  |
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 (as a percentage) |  |  |  |  |  | 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 (as a percentage) |  |  |  |  |  | 100.00% |  |  |
Employer matching contribution (as a percentage) |  |  |  |  |  | 1.00% |  |  |
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 (as a percentage) |  |  |  |  |  | 5.00% |  |  |
Employer matching contribution (as a percentage) |  |  |  |  |  | 50.00% |  |  |
Rogers Employee Savings and Investment Plan (RESIP) | Suspense Account Held Within a Trust |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |  |
Plan assets |  |  |  |  |  |  |  |  | $ 7,400,000

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