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Long-Term Debt - Additional information (Detail)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Nov. 30, 2018
USD ($)
Apr. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Mar. 30, 2019
USD ($)
subsidiary
Dec. 31, 2018
USD ($)
Parsons, KS | 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             $ 3,000,000  
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]                
Borrowings from debt             3,200,000  
Remaining borrowing capacity             96,600,000  
Outstanding standby letters of credit             $ 200,000