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Subsequent Events - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Nov. 30, 2021
Oct. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Subsequent Event [Line Items]        
Line of credit outstanding     $ 1,491 $ 1,443
Senior Notes [Member]        
Subsequent Event [Line Items]        
Line of credit outstanding     $ 350  
Line of credit facility, interest rate     4.125%  
Subsequent Event [Member] | Safety Services [Member]        
Subsequent Event [Line Items]        
Purchase price $ 34      
Subsequent Event [Member] | Senior Notes [Member] | APi Escrow Corp. [Member]        
Subsequent Event [Line Items]        
Line of credit outstanding   $ 300    
Line of credit facility, interest rate   4.75%