Guarantor/Non-Guarantor Financial Information - Summary of Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows from Operating Activities:
Net income (loss)	$ 10,040	$ (8,915)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	35,675	28,214
Amortization of deferred financing costs and discounts	1,306	1,593
Change in fair value of private placement warrants	3,734	2,067
Loss on extinguishment of debt	0	5,334
Credit loss expense	3,505	2,402
Deferred income taxes	(18,771)	281
Stock-based compensation	4,446	2,908
Other	354	133
Changes in operating assets and liabilities:
Accounts receivable, net	(14,300)	(26,672)
Unbilled receivables	(10,265)	(859)
Inventory, net	(5,722)	(691)
Prepaid expenses and other assets	8,235	429
Deferred revenue	46	(44)
Accounts payable and other current liabilities	477
Other liabilities	13,441	459
Net cash provided by operating activities	31,247	9,013
Cash Flows from Investing Activities:
Payment of contingent consideration	(412)	0
Purchases of installation and service parts and property and equipment	(11,478)	(3,704)
Cash proceeds from the sale of assets	25
Net cash used in investing activities	(11,865)	(3,648)
Cash Flows from Financing Activities:
Borrowings of long-term debt	0	996,750
Repayment on the revolver	(25,000)	0
Repayment of long-term debt	(2,255)	(865,642)
Payment of debt issuance costs	(54)	(5,732)
Payment of debt extinguishment costs	0	(604)
Proceeds from the exercise of stock options	93	0
Payment of employee tax withholding related to RSUs vesting	(1,436)	(857)
Net cash (used in) provided by financing activities	(28,652)	123,915
Effect of exchange rate changes on cash and cash equivalents	2,231
Net (decrease) increase in cash, cash equivalents and restricted cash	(7,039)	129,532
Cash, cash equivalents and restricted cash - beginning of period	104,432	120,892
Cash, cash equivalents and restricted cash - end of period	97,393	250,424
Supplemental cash flow information:
Interest paid	8,188	6,996
Income taxes paid, net of refunds	1,147	238
Supplemental non-cash investing and financing activities:
Purchases of installation and service parts and property and equipment in accounts payable and accrued liabilities at period-end	4,057	$ 1,355
Verra Mobility Corporation (Ultimate Parent)
Cash Flows from Operating Activities:
Net income (loss)	10,040
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Income (Loss) From Equity Investments	10,040
VM Consolidated Inc. (Guarantor Subsidiary)
Cash Flows from Operating Activities:
Net income (loss)	10,040
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	30,507
Amortization of deferred financing costs and discounts	1,306
Change in fair value of private placement warrants	3,734
Credit loss expense	3,372
Deferred income taxes	(19,247)
Stock-based compensation	4,446
Other	354
Income (Loss) From Equity Investments	(1,312)
Changes in operating assets and liabilities:
Accounts receivable, net	(12,054)
Unbilled receivables	(11,305)
Inventory, net	(2,559)
Prepaid expenses and other assets	9,173
Deferred revenue	(1,470)
Accounts payable and other current liabilities	2,670
Due to affiliates	(1,148)
Other liabilities	13,329
Net cash provided by operating activities	32,460
Cash Flows from Investing Activities:
Payment of contingent consideration	(412)
Purchases of installation and service parts and property and equipment	(8,286)
Cash proceeds from the sale of assets	25
Net cash used in investing activities	(8,673)
Cash Flows from Financing Activities:
Repayment on the revolver	(25,000)
Repayment of long-term debt	(2,255)
Payment of debt issuance costs	(54)
Proceeds from the exercise of stock options	93
Payment of employee tax withholding related to RSUs vesting	(1,436)
Net cash (used in) provided by financing activities	(28,652)
Net (decrease) increase in cash, cash equivalents and restricted cash	(4,865)
Cash, cash equivalents and restricted cash - beginning of period	68,989
Cash, cash equivalents and restricted cash - end of period	64,124
Supplemental cash flow information:
Interest paid	8,188
Income taxes paid, net of refunds	1,124
Supplemental non-cash investing and financing activities:
Purchases of installation and service parts and property and equipment in accounts payable and accrued liabilities at period-end	4,057
Non-guarantor Subsidiaries
Cash Flows from Operating Activities:
Net income (loss)	(1,312)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	5,168
Credit loss expense	133
Deferred income taxes	476
Changes in operating assets and liabilities:
Accounts receivable, net	(2,246)
Unbilled receivables	(1,040)
Inventory, net	(3,163)
Prepaid expenses and other assets	(938)
Deferred revenue	(1,516)
Accounts payable and other current liabilities	(3,147)
Due to affiliates	1,148
Other liabilities	112
Net cash provided by operating activities	(1,213)
Cash Flows from Investing Activities:
Purchases of installation and service parts and property and equipment	(3,192)
Net cash used in investing activities	(3,192)
Cash Flows from Financing Activities:
Effect of exchange rate changes on cash and cash equivalents	2,231
Net (decrease) increase in cash, cash equivalents and restricted cash	(2,174)
Cash, cash equivalents and restricted cash - beginning of period	35,443
Cash, cash equivalents and restricted cash - end of period	33,269
Supplemental cash flow information:
Income taxes paid, net of refunds	23
Eliminations
Cash Flows from Operating Activities:
Net income (loss)	(8,728)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Income (Loss) From Equity Investments	$ (8,728)