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Related Party Transactions - Additional Information (Details)					3 Months Ended		12 Months Ended
		Aug. 20, 2021 USD ($) $ / shares shares	Jan. 27, 2020 USD ($) $ / shares shares	Apr. 26, 2019 $ / shares	Dec. 31, 2021 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) yr shares	Dec. 31, 2019 USD ($)	Aug. 09, 2021 USD ($)	Oct. 17, 2018 USD ($)
Related Party Transaction [Line Items]
Tax receivable agreement, amount payable, current					$ 5,107,000		$ 5,107,000	$ 4,791,000
Tax receivable agreement, amount payable, non-current					56,615,000		56,615,000	67,869,000
Reduction to tax receivable agreement liability									$ 2,940,000
Payment for share repurchase							100,000,000
Revenue							$ 550,590,000	393,593,000	448,737,000
Overallotment Option
Related Party Transaction [Line Items]
Number of additional common stock purchased | shares		1,200,000
Offering price per share | $ / shares		$ 14.75
Proceeds from secondary offering		$ 0
Percentage of common stock share outstanding held							5.10%
Common Class A
Related Party Transaction [Line Items]
Number of common stock sold in secondary offering | shares		8,000,000
Common Class A | Share Repurchase Program
Related Party Transaction [Line Items]
Share repurchase program, authorized amount										$ 100,000
Payment for share repurchase							$ 100,000,000
Decrease in additional paid in capital, stock issuance costs							72,000,000.0
Increase in Accumulated Deficit, Stock Issued, Issuance Costs							$ 28,000,000.0
Platinum Stockholder | Common Class A | Share Repurchase Program
Related Party Transaction [Line Items]
Common stock price | $ / shares		$ 14.60
Stock Repurchased and Retired During Period, Shares | shares		6,849,315
Platinum Stockholder | Common Stock Price Greater than $13.00
Related Party Transaction [Line Items]
Common stock price | $ / shares				$ 13.00
Platinum Stockholder | Common Stock Price Greater than $15.50
Related Party Transaction [Line Items]
Common stock price | $ / shares			$ 15.50
Redflex Irish Investments Pty Ltd [Member]
Related Party Transaction [Line Items]
Percentage of Non-Voting Interest Acquired							16.00%
Cost method investment					3,700,000		$ 3,700,000
Revenue							500,000
Dividend income							$ 300,000
Minimum | Platinum Stockholder | Common Stock Price Greater than $13.00
Related Party Transaction [Line Items]
Common stock price threshold trading days				10 days
Minimum | Platinum Stockholder | Common Stock Price Greater than $15.50
Related Party Transaction [Line Items]
Common stock price threshold trading days			10 days
Maximum | Platinum Stockholder | Common Stock Price Greater than $13.00
Related Party Transaction [Line Items]
Common stock price threshold trading days				20 days
Maximum | Platinum Stockholder | Common Stock Price Greater than $15.50
Related Party Transaction [Line Items]
Common stock price threshold trading days			20 days
Selling, General and Administrative Expenses | Overallotment Option
Related Party Transaction [Line Items]
Expense incurred in secondary offering		$ 400,000
Verra Mobility Business Combination
Related Party Transaction [Line Items]
Tax Receivable Agreement, portion of net cash savings paid out							50.00%
Tax Receivable Agreement, portion of net cash savings retained							50.00%
Estimated maximum benefit to be paid to tax receivable agreement					70,000,000.0		$ 70,000,000.0
Tax receivable agreement, amount payable					61,700		61,700
Tax receivable agreement, amount payable, current					5,100,000		5,100,000
Tax receivable agreement, amount payable, non-current					56,600		56,600
Tax receivable agreement, amount paid, current					5,100,000	$ 4,800,000
Increase (decrease) to payable related to tax receivable agreement adjustment							(1,000,000.0)	$ 6,800,000	(100,000)
Contingency period								5 years
Increase Decrease To Payable Related To Tax Receivable Agreement Adjustment							(1,000,000.0)	$ 6,800,000	$ (100,000)
Verra Mobility Business Combination | Platinum Stockholder | Common Stock Price Greater than $13.00 and $15.50
Related Party Transaction [Line Items]
Earn-out shares issuable if condition met | shares			5,000,000
Verra Mobility Business Combination | Platinum Stockholder | Common Stock Price Greater than $13.00 and $15.50 | Common Stock Including Additional Paid in Capital
Related Party Transaction [Line Items]
Earn-out shares issued value			$ 36,600,000
Verra Mobility Business Combination | Platinum Stockholder | Common Stock Price Greater than $13.00 | Potential Future Shares
Related Party Transaction [Line Items]
Earn-out shares issued value								0
Verra Mobility Business Combination | Platinum Stockholder | Common Stock Price Greater than $15.50 | Common Stock Contingent Consideration
Related Party Transaction [Line Items]
Earn-out shares issued value			$ 36,600,000
Verra Mobility Business Combination | Platinum Stockholder | Common Stock Price Greater than $15.50 | Potential Future Shares
Related Party Transaction [Line Items]
Earn-out shares issued value								$ 5,000,000.0
Verra Mobility Business Combination | Platinum Stockholder | Earn-Out Agreement
Related Party Transaction [Line Items]
Contingent consideration					$ 36,600		$ 36,600				$ 73,150,000
Term of volatility and risk free rates utilizing a peer group | yr								5
Verra Mobility Business Combination | Platinum Stockholder | Earn-Out Agreement | Earn-Out Scenario Five
Related Party Transaction [Line Items]
Earn-out shares issuable if condition met | shares								0
Verra Mobility Business Combination | Platinum Stockholder | Earn-Out Agreement | Common Stock Price Greater than $13.00
Related Party Transaction [Line Items]
Earn-out shares issuable if condition met | shares							2,500,000,000
Common stock price | $ / shares	[1]				$ 13.00		$ 13.00
Verra Mobility Business Combination | Platinum Stockholder | Earn-Out Agreement | Common Stock Price Greater than $15.50
Related Party Transaction [Line Items]
Earn-out shares issuable if condition met | shares							2,500,000,000
Common stock price | $ / shares	[1]				$ 15.50		$ 15.50
Verra Mobility Business Combination | Minimum
Related Party Transaction [Line Items]
Common stock price threshold trading days								10 days
Verra Mobility Business Combination | Maximum
Related Party Transaction [Line Items]
Common stock price threshold trading days								20 days
Verra Mobility Business Combination | Maximum | Platinum Stockholder | Earn-Out Agreement
Related Party Transaction [Line Items]
Earn-out shares issuable if condition met | shares								10,000,000
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