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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Additional Information) (Detail) - USD ($) |  | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 18, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Merged plan assets |  | $ 12,790,000 | $ 12,790,000 |  | $ 12,790,000 | $ 19,273,000 |
Pension settlement charges, net of tax (Note 4) |  |  | (53,200,000) |  | 43,934,000 | 0 | $ 0
Termination of the Merged Plan |  |  |  |  | (53,213,000) | 0 | 0
Projected benefit obligation of plan with accumulated benefit obligation in excess of plan assets |  | 30,000,000.0 | 30,000,000.0 |  | 30,000,000.0 | 172,400,000 |
Accumulated benefit obligation of plan with plan assets in excess of accumulated benefit obligation |  | 30,000,000.0 | 30,000,000.0 |  | 30,000,000.0 | 172,400,000 |
Fair value of the plan assets of plan with plan assets in excess of accumulated benefit obligation |  | $ 42,800,000 | $ 42,800,000 |  | $ 42,800,000 | $ 191,700,000 |
Health care cost, employees age |  |  |  |  | 65 years | 65 years |
Health care cost trend rate annual change (as a percentage) |  |  |  |  | 0.25% |  |
Historical return on plan assets over 20 years (as a percentage) |  |  |  |  | 6.32% |  |
Employer contributions |  |  |  |  |  | $ 25,000,000.0 |
Document Fiscal Year Focus |  |  |  |  | 2019 |  |
Payment for Pension Benefits |  |  |  |  | $ 103,000 | $ 25,354,000 | 906,000
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% | 7.00% |
Ultimate health care cost trend rate (as a percentage) |  | 4.50% | 4.50% |  | 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% | 7.00% |
Ultimate health care cost trend rate (as a percentage) |  | 4.50% | 4.50% |  | 4.50% |  |
Pension Benefits |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Annuity payments | $ 123,500,000 | $ 1,300,000 |  |  |  |  |
Lump sum distributions |  |  |  |  | $ 38,900,000 |  |
Merged plan assets |  | 12,790,000 | $ 12,790,000 |  | 12,790,000 | $ 19,273,000 |
PBO and ABO of plan assets for the other postretirement benefit plans with a PBO or ABO in excess of plan assets |  | $ 12,535,000 | $ 12,535,000 |  | $ 12,535,000 | 19,044,000 |
Expected long-term rate of return on plan assets (as a percentage) |  |  |  |  | 4.91% |  |
Employer contributions |  |  |  |  | $ 41,000 | 25,000,000 |
Payment for Pension Benefits |  |  |  |  | $ 162,484,000 | $ 0 |
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% | 1.00% |
Pension Benefits | Debt Securities |  |  |  |  |  |  |
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% | 99.00% |
Other Postretirement Benefits |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Merged plan assets |  | $ 0 | $ 0 |  | $ 0 | $ 0 |
PBO and ABO of plan assets for the other postretirement benefit plans with a PBO or ABO in excess of plan assets |  | (1,599,000) | (1,599,000) |  | (1,599,000) | (1,803,000) |
Employer contributions |  |  |  |  | 273,000 | 364,000 |
Payment for Pension Benefits |  |  |  |  | 0 | 0 |
Rogers Employee Savings and Investment Plan (RESIP) |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions |  |  |  |  | 4,400,000 | $ 5,600,000 |
IRS deferral limit |  |  |  |  | $ 19,000 |  |
Employee compensation subject to employer matching percent (as a percentage) |  |  |  |  | 6.00% |  |
Payment for Pension Benefits |  |  |  |  |  |  | $ 4,000,000.0
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% |  |
Minimum | Pension Benefits |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Merged plan assets |  | $ 9,000,000.0 | $ 9,000,000.0 |  | $ 9,000,000.0 |  |
Forecast |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Termination of the Merged Plan |  |  |  | $ 700,000 |  |  |

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