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Long-Term Debt - Additional information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 23, 2018
USD ($)
Sep. 11, 2017
USD ($)
Dec. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Jul. 04, 2015
USD ($)
Sep. 29, 2018
USD ($)
subsidiary
Sep. 30, 2017
USD ($)
Jun. 30, 2015
USD ($)
Debt Instrument [Line Items]                    
Preliminary purchase price allocation               $ 30,711,000 $ 0  
Parsons, KS | Municipal Bonds                    
Debt Instrument [Line Items]                    
Revenue bonds purchased     $ 14,200,000   $ 9,900,000          
Parsons, KS                    
Debt Instrument [Line Items]                    
Proceeds received from sale of property to be leased back     14,200,000   9,900,000          
Total lease liability from assets sold     $ 14,200,000   $ 9,900,000          
Interest rate cap                    
Debt Instrument [Line Items]                    
Interest rate hedge           $ 135,000,000        
Payments made for interest rate hedge           $ 1,000,000        
New Credit Facilities                    
Debt Instrument [Line Items]                    
Number of subsidiaries that are not guarantors on debt | subsidiary               1    
New Credit Facilities | First two years                    
Debt Instrument [Line Items]                    
Prepayment amount of principal outstanding               5.00%    
New Credit Facilities | Third year                    
Debt Instrument [Line Items]                    
Prepayment amount of principal outstanding               7.50%    
New Credit Facilities | Fourth and fifth years                    
Debt Instrument [Line Items]                    
Prepayment amount of principal outstanding               10.00%    
New Credit Facilities | Minimum                    
Debt Instrument [Line Items]                    
Commitment fee               0.175%    
New Credit Facilities | Maximum                    
Debt Instrument [Line Items]                    
Commitment fee               0.30%    
New Credit Facilities | LIBOR | Minimum                    
Debt Instrument [Line Items]                    
Spread on variable rate               1.50%    
New Credit Facilities | LIBOR | Maximum                    
Debt Instrument [Line Items]                    
Spread on variable rate               2.75%    
New Credit Facilities | Federal Funds Rate                    
Debt Instrument [Line Items]                    
Spread on base rate               0.50%    
New Credit Facilities | Eurodollar Rate                    
Debt Instrument [Line Items]                    
Spread on base rate               1.00%    
New Credit Facilities | Base Rate | Minimum                    
Debt Instrument [Line Items]                    
Spread on variable rate               0.50%    
New Credit Facilities | Base Rate | Maximum                    
Debt Instrument [Line Items]                    
Spread on variable rate               1.75%    
Senior Secured Term Loan | New Credit Facilities                    
Debt Instrument [Line Items]                    
Debt amount                   $ 275,000,000.0
Term             5 years      
Revolving Credit Facility | New Credit Facilities                    
Debt Instrument [Line Items]                    
Debt amount                   $ 200,000,000.0
Debt issuance costs             $ 4,800,000      
Borrowings from debt               $ 70,700,000    
Remaining borrowing capacity               129,000,000    
Outstanding standby letters of credit               $ 300,000    
Certified Thermoplastics Co., LLC                    
Debt Instrument [Line Items]                    
Preliminary purchase price allocation $ 30,700,000                  
Borrowings from debt $ 30,800,000                  
Lightning Diversion Systems, Inc.                    
Debt Instrument [Line Items]                    
Preliminary purchase price allocation   $ 60,000,000                
Borrowings from debt   $ 61,400,000   $ 600,000