Related Party Transactions - Summary of Earn Out Shares Issued by Company to Platinum Stockholder (Details) - Platinum Stockholder - Verra Mobility Business Combination - $ / shares		3 Months Ended
		Mar. 31, 2022	Jan. 27, 2020	Apr. 26, 2019
Common Stock Price Greater than $13.00
Related Party Transaction [Line Items]
Common Stock Price thresholds				$ 13.00
Common Stock Price Greater than $13.00 | Earn-Out Agreement
Related Party Transaction [Line Items]
Common Stock Price thresholds	[1]	$ 13.00
One-time issuance of shares		2,500,000
Common Stock Price Greater than $15.50
Related Party Transaction [Line Items]
Common Stock Price thresholds			$ 15.50
Common Stock Price Greater than $15.50 | Earn-Out Agreement
Related Party Transaction [Line Items]
Common Stock Price thresholds	[1]	$ 15.50
One-time issuance of shares		2,500,000
Common Stock Price Greater than $18.00 | Earn-Out Agreement
Related Party Transaction [Line Items]
Common Stock Price thresholds		$ 18.00
One-time issuance of shares		2,500,000
Common Stock Price Greater than $20.50 | Earn-Out Agreement
Related Party Transaction [Line Items]
Common Stock Price thresholds		$ 20.50
One-time issuance of shares		2,500,000

[1] The first and second tranches of Earn-Out Shares have been issued, as discussed below.