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Amount of liability recognized arising from contingent consideration in a business combination.

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Related Party Transactions - Additional Information (Details) $ / shares in Units, $ in Thousands			6 Months Ended
	Jan. 27, 2020 USD ($) $ / shares	Apr. 26, 2019 $ / shares	Jun. 30, 2020 USD ($) yr $ / shares shares	Dec. 31, 2019 USD ($)	Oct. 01, 2018 USD ($)
Related Party Transaction [Line Items]
Estimated maximum benefit to be paid to tax receivable agreement			$ 65,620	$ 61,174
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
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
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
Platinum Stockholder \| Earn-Out Agreement \| Earn-Out Scenario Five
Related Party Transaction [Line Items]
Earn-out shares issuable if condition met \| shares			0
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
Common stock price \| $ / shares			$ 13.00
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
Common stock price \| $ / shares			$ 15.50
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
Maximum \| Platinum Stockholder \| Earn-Out Agreement
Related Party Transaction [Line Items]
Earn-out shares issuable if condition met \| shares			10,000,000
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
Increase to payable related to tax receivable agreement adjustment			4,400
Tax receivable agreement, amount payable			$ 70,200
Contingency period			5 years
Verra Mobility Business Combination \| Platinum Stockholder \| Earn-Out Agreement
Related Party Transaction [Line Items]
Contingent consideration					$ 73,150
Term of volatility and risk free rates utilizing a peer group \| yr			5
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 \| Accrued Liabilities
Related Party Transaction [Line Items]
Tax receivable agreement, amount payable			$ 4,600
Verra Mobility Business Combination \| Payable Related to Tax Receivable Agreement
Related Party Transaction [Line Items]
Tax receivable agreement, amount payable			$ 65,600