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Long-Term Debt - Additional information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 08, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 30, 2018
USD ($)
Apr. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Sep. 28, 2019
USD ($)
Sep. 28, 2019
USD ($)
subsidiary
Sep. 29, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                      
Repayments of debt                 $ 118,000 $ 0  
Preliminary purchase price allocation                 $ 0 $ 30,711,000  
Municipal Bonds                      
Debt Instrument [Line Items]                      
Revenue bonds purchased   $ 2,200,000     $ 14,200,000 $ 9,900,000         $ 2,200,000
Parsons, KS                      
Debt Instrument [Line Items]                      
Proceeds received from sale of property to be leased back   2,200,000     14,200,000 9,900,000          
Total lease liability from assets sold   $ 2,200,000     $ 14,200,000 $ 9,900,000         2,200,000
Interest rate cap                      
Debt Instrument [Line Items]                      
Interest rate hedge             $ 135,000,000        
Payments made for interest rate hedge             $ 1,000,000        
New Term Loan Maturing November 21, 2025                      
Debt Instrument [Line Items]                      
Debt issuance costs, line of credit arrangements     $ 1,700,000                
Accumulated amortization of debt issuance costs     100,000                
Debt issuance costs     $ 1,800,000                
Term     7 years                
New Revolving Credit Facility Maturing November 21, 2023                      
Debt Instrument [Line Items]                      
Debt issuance costs, line of credit arrangements     $ 1,800,000                
Accumulated amortization of debt issuance costs     200,000                
Debt issuance costs     $ 2,000,000                
Term     5 years                
New Existing Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Amortization of debt issuance costs     $ 500,000                
Gain (loss) on extinguishment of debt                     $ (900,000)
Existing Term Loan                      
Debt Instrument [Line Items]                      
Amortization of debt issuance costs     400,000                
New Credit Facilities                      
Debt Instrument [Line Items]                      
Debt issuance costs, line of credit arrangements     3,500,000                
Number of subsidiaries that are not guarantors on debt | subsidiary                 2    
Certified Thermoplastics Co., LLC                      
Debt Instrument [Line Items]                      
Borrowings from debt       $ 30,800,000              
Preliminary purchase price allocation       $ 30,700,000              
Secured Debt | New Term Loan Maturing November 21, 2025                      
Debt Instrument [Line Items]                      
Debt amount     $ 240,000,000.0                
Prepayment amount of principal outstanding     0.25%                
Repayments of debt               $ 600,000 $ 6,600,000    
Borrowings from debt     $ 240,000,000                
Secured Debt | New Term Loan Maturing November 21, 2025 | LIBOR | Minimum                      
Debt Instrument [Line Items]                      
Spread on variable rate     3.75%                
Secured Debt | New Term Loan Maturing November 21, 2025 | LIBOR | Maximum                      
Debt Instrument [Line Items]                      
Spread on variable rate     4.00%                
Secured Debt | New Term Loan Maturing November 21, 2025 | Federal Funds Rate                      
Debt Instrument [Line Items]                      
Spread on base rate     0.50%                
Secured Debt | New Term Loan Maturing November 21, 2025 | Eurodollar Rate                      
Debt Instrument [Line Items]                      
Spread on base rate     1.00%                
Secured Debt | New Term Loan Maturing November 21, 2025 | Base Rate | Minimum                      
Debt Instrument [Line Items]                      
Spread on variable rate     3.75%                
Secured Debt | New Term Loan Maturing November 21, 2025 | Base Rate | Maximum                      
Debt Instrument [Line Items]                      
Spread on variable rate     4.00%                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023                      
Debt Instrument [Line Items]                      
Debt amount     $ 100,000,000.0                
Percentage of excess cash flow payment when leverage ratio is greater than 3.25     50.00%                
Percentage of excess cash flow payment when leverage ratio is less than or equal to 3.25 but greater than 2.50     25.00%                
Percentage of excess cash flow payment when leverage ratio is less than or equal to 2.50     0.00%                
Borrowings from debt     $ 7,900,000                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023 | Minimum                      
Debt Instrument [Line Items]                      
Commitment fee     0.20%                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023 | Maximum                      
Debt Instrument [Line Items]                      
Commitment fee     0.30%                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023 | LIBOR | Minimum                      
Debt Instrument [Line Items]                      
Spread on variable rate     1.75%                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023 | LIBOR | Maximum                      
Debt Instrument [Line Items]                      
Spread on variable rate     2.75%                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023 | Federal Funds Rate                      
Debt Instrument [Line Items]                      
Spread on base rate     0.50%                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023 | Eurodollar Rate                      
Debt Instrument [Line Items]                      
Spread on base rate     1.00%                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023 | Base Rate | Minimum                      
Debt Instrument [Line Items]                      
Spread on variable rate     0.75%                
Revolving Credit Facility | New Revolving Credit Facility Maturing November 21, 2023 | Base Rate | Maximum                      
Debt Instrument [Line Items]                      
Spread on variable rate     1.75%                
Revolving Credit Facility | New Existing Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Repayments of debt     $ 247,900,000                
Revolving Credit Facility | New Credit Facilities                      
Debt Instrument [Line Items]                      
Remaining borrowing capacity               99,800,000 99,800,000    
Outstanding standby letters of credit               $ 200,000 $ 200,000    
Subsequent Event | Nobles Parent Inc.                      
Debt Instrument [Line Items]                      
Preliminary purchase price allocation $ 77,000,000                    
Subsequent Event | Nobles Parent Inc. | New Revolving Credit Facility Maturing November 21, 2023                      
Debt Instrument [Line Items]                      
Borrowings from debt $ 77,300,000