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Guarantor/Non-Guarantor Financial Information (Unaudited) - Summary of Consolidated Statements of Cash Flows (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Statement of Income Captions [Line Items]      
Asset retirement obligations $ 5,210 $ 133  
Redflex Holdings Limited      
Condensed Statement of Income Captions [Line Items]      
Asset retirement obligations $ 3,900 $ 3,900 $ 3,900