Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.21.2
Summary of Significant Accounting Policies - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Customer
Sep. 30, 2020
USD ($)
Customer
Sep. 30, 2021
USD ($)
Customer
Sep. 30, 2020
USD ($)
Customer
Dec. 31, 2020
USD ($)
Customer
Accounting Policies [Line Items]          
Unamortized original issue discount and other debt issuance costs $ 11,332   $ 11,332   $ 13,422
Amortization expense 13,276 $ 12,836 39,818 $ 38,264  
Inventory Valuation Reserves 339 $ 339 339 $ 339  
Goodwill $ 486,375   $ 486,375   $ 482,041
Accounts Receivable [Member]          
Accounting Policies [Line Items]          
Accounts Receivable Percentage 10.00%   10.00%    
Accounts Receivable [Member] | Customer Two | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage         44.00%
Fire Safety | Revenue Benchmark [Member] | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage 63.00% 89.00% 48.00% 49.00%  
Number of customers | Customer 2 2 2 2  
Fire Safety | Revenue Benchmark [Member] | Customer One | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage 40.00% 54.00% 33.00% 37.00%  
Fire Safety | Revenue Benchmark [Member] | Customer Two | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage 23.00% 35.00% 15.00% 12.00%  
Fire Safety | Accounts Receivable [Member] | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage     93.00%    
Number of customers | Customer     3   2
Fire Safety | Accounts Receivable [Member] | Customer One | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage     45.00%   18.00%
Fire Safety | Accounts Receivable [Member] | Customer Two | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage     31.00%   15.00%
Fire Safety | Accounts Receivable [Member] | Customer Three | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage     17.00%    
Oil Additives | Accounts Receivable [Member] | Customer Concentration Risk          
Accounting Policies [Line Items]          
Number of customers | Customer         1
Oil Additives | Accounts Receivable [Member] | Customer Three | Customer Concentration Risk          
Accounting Policies [Line Items]          
Concentration Risk, Percentage         11.00%
Term Loan          
Accounting Policies [Line Items]          
Amortization expense $ 1,393 $ 1,516 $ 2,090 $ 2,274  
Revolving Credit Facility          
Accounting Policies [Line Items]          
Unamortized deferred financing costs 829   829   $ 1,170
Amortization expense $ 228 $ 250 $ 342 $ 375