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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