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Long-Term Debt - Additional information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Nov. 21, 2018
Apr. 23, 2018
Sep. 11, 2017
Oct. 31, 2017
Sep. 30, 2017
Oct. 31, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]                  
Repayments of debt             $ 0 $ 3,000 $ 23,000
Loss on Extinguishment of Debt             926,000 0 0
Purchase price, net of cash acquired             0 59,798,000 0
Interest rate cap premiums                  
Debt Instrument [Line Items]                  
Hedging asset           $ 135,000,000      
Payments for hedging asset           $ 1,000,000      
New Term Loan                  
Debt Instrument [Line Items]                  
Debt issuance costs, net             1,700,000    
Debt issuance costs             1,800,000    
Accumulated Amortization of Debt Issuance Costs, Line of Credit Arrangements             $ 100,000    
Term of debt instrument             7 years    
New Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt issuance costs, net             $ 1,800,000    
Debt issuance costs             2,000,000    
Accumulated Amortization of Debt Issuance Costs, Line of Credit Arrangements             $ 200,000    
Term of debt instrument             5 years    
New Credit Facilities                  
Debt Instrument [Line Items]                  
Debt issuance costs, net             $ 3,500,000    
New Existing Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Amortization of debt issuance costs $ 500,000                
Loss on Extinguishment of Debt             900,000    
Existing Term Loan                  
Debt Instrument [Line Items]                  
Amortization of debt issuance costs 400,000                
Parsons, KS | Municipal Bonds                  
Debt Instrument [Line Items]                  
Purchase of industrial revenue bonds             2,200,000 14,200,000 9,900,000
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
Certified Thermoplastics Co., LLC                  
Debt Instrument [Line Items]                  
Purchase price, net of cash acquired   $ 30,700,000              
Payments to acquire business   $ 30,800,000              
Lightning Diversion Systems, Inc.                  
Debt Instrument [Line Items]                  
Purchase price, net of cash acquired     $ 60,000,000   $ 60,000,000        
Payments to acquire business     $ 61,400,000 $ 600,000          
Secured Debt | New Term Loan                  
Debt Instrument [Line Items]                  
Face amount of instrument $ 240,000,000.0                
Prepayment percentage of principal 0.25%                
Proceeds from lines of credit $ 240,000,000                
Secured Debt | New Term Loan | Federal Funds Rate                  
Debt Instrument [Line Items]                  
Fixed rate spread (percent) 0.50%                
Secured Debt | New Term Loan | Eurodollar Rate                  
Debt Instrument [Line Items]                  
Fixed rate spread (percent) 1.00%                
Secured Debt | New Term Loan | Minimum | LIBOR Rate                  
Debt Instrument [Line Items]                  
Variable rate spread (percent) 3.75%                
Secured Debt | New Term Loan | Minimum | Base Rate                  
Debt Instrument [Line Items]                  
Variable rate spread (percent) 3.75%                
Secured Debt | New Term Loan | Maximum | LIBOR Rate                  
Debt Instrument [Line Items]                  
Variable rate spread (percent) 4.00%                
Secured Debt | New Term Loan | Maximum | Base Rate                  
Debt Instrument [Line Items]                  
Variable rate spread (percent) 4.00%                
Revolving Credit Facility | Minimum                  
Debt Instrument [Line Items]                  
Commitment fee (percent) 0.20%                
Revolving Credit Facility | Maximum                  
Debt Instrument [Line Items]                  
Commitment fee (percent) 0.30%                
Revolving Credit Facility | New Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Face amount of instrument $ 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 25.00%                
Percentage of excess cash flow payment when leverage ratio is less than or equal to 2.50 0.00%                
Proceeds from lines of credit $ 7,900,000                
Revolving Credit Facility | New Revolving Credit Facility | Federal Funds Rate                  
Debt Instrument [Line Items]                  
Fixed rate spread (percent) 0.50%                
Revolving Credit Facility | New Revolving Credit Facility | Eurodollar Rate                  
Debt Instrument [Line Items]                  
Fixed rate spread (percent) 1.00%                
Revolving Credit Facility | New Revolving Credit Facility | Minimum | LIBOR Rate                  
Debt Instrument [Line Items]                  
Variable rate spread (percent) 1.75%                
Revolving Credit Facility | New Revolving Credit Facility | Minimum | Base Rate                  
Debt Instrument [Line Items]                  
Variable rate spread (percent) 0.75%                
Revolving Credit Facility | New Revolving Credit Facility | Maximum | LIBOR Rate                  
Debt Instrument [Line Items]                  
Variable rate spread (percent) 2.75%                
Revolving Credit Facility | New Revolving Credit Facility | Maximum | Base Rate                  
Debt Instrument [Line Items]                  
Variable rate spread (percent) 1.75%                
Revolving Credit Facility | New Credit Facilities                  
Debt Instrument [Line Items]                  
Remaining borrowing capacity             99,700,000    
Outstanding standby letters of credit             $ 300,000    
Revolving Credit Facility | New Existing Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Repayments of debt $ 247,900,000