Guarantor/Non-Guarantor Financial Information - Summary of Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 93,377	$ 101,283	$ 249,605
Restricted cash	4,016	3,149	819
Accounts receivable (net of allowance for credit loss of $14.3 million )	171,906	160,979
Unbilled receivables	39,484	29,109
Inventory, net	15,451	12,093
Prepaid expenses and other current assets	38,745	41,456
Total current assets	362,979	348,069
Installation and service parts, net	15,491	13,332
Property and equipment, net	99,351	96,066
Operating lease assets	39,944	38,862
Intangible assets, net	460,083	487,299
Goodwill	837,910	838,867
Other non-current assets	8,727	14,561
Total assets	1,824,485	1,837,056
Current liabilities:
Accounts payable	63,049	67,556
Deferred revenue	27,369
Accrued liabilities	46,668	38,435
Payable to related party pursuant to tax receivable agreement, current portion	5,107
Current portion of long-term debt	11,952	36,952
Total current liabilities	154,145	175,191
Long-term debt, net of current portion	1,206,276	1,206,802
Operating lease liabilities, net of current portion	35,850	34,984
Payable to related party pursuant to tax receivable agreement, net of current portion	56,615
Private placement warrant liabilities	42,200	38,466
Asset retirement obligation	12,032	11,824
Deferred tax liabilities, net	28,286	47,524
Other long-term liabilities	13,266	5,686
Total liabilities	1,548,670	1,577,092
Total stockholders' equity	275,815	259,964	$ 308,518	$ 315,572
Total liabilities and stockholders' equity	1,824,485	$ 1,837,056
Verra Mobility Corporation (Ultimate Parent)
Current assets:
Investment in subsidiary	106,556
Total current assets	106,556
Due from affiliates	169,259
Total assets	275,815
Current liabilities:
Total stockholders' equity	275,815
Total liabilities and stockholders' equity	275,815
VM Consolidated Inc. (Guarantor Subsidiary)
Current assets:
Cash and cash equivalents	60,209
Restricted cash	3,915
Accounts receivable (net of allowance for credit loss of $14.3 million )	158,861
Unbilled receivables	35,524
Investment in subsidiary	156,179
Inventory, net	1,124
Prepaid expenses and other current assets	28,386
Total current assets	444,198
Installation and service parts, net	15,491
Property and equipment, net	82,450
Operating lease assets	32,075
Intangible assets, net	344,457
Goodwill	689,501
Other non-current assets	4,566
Total assets	1,612,738
Current liabilities:
Accounts payable	47,124
Deferred revenue	15,699
Accrued liabilities	35,592
Payable to related party pursuant to tax receivable agreement, current portion	5,107
Current portion of long-term debt	11,952
Total current liabilities	115,474
Long-term debt, net of current portion	1,206,276
Operating lease liabilities, net of current portion	29,961
Payable to related party pursuant to tax receivable agreement, net of current portion	56,615
Private placement warrant liabilities	42,200
Due to affiliates	27,173
Asset retirement obligation	12,006
Deferred tax liabilities, net	3,222
Other long-term liabilities	13,255
Total liabilities	1,506,182
Total stockholders' equity	106,556
Total liabilities and stockholders' equity	1,612,738
Non-guarantor Subsidiaries
Current assets:
Cash and cash equivalents	33,168
Restricted cash	101
Accounts receivable (net of allowance for credit loss of $14.3 million )	13,045
Unbilled receivables	3,960
Inventory, net	14,327
Prepaid expenses and other current assets	10,359
Total current assets	74,960
Property and equipment, net	16,901
Operating lease assets	7,869
Intangible assets, net	115,626
Goodwill	148,409
Other non-current assets	4,161
Total assets	367,926
Current liabilities:
Accounts payable	15,925
Deferred revenue	11,670
Accrued liabilities	11,076
Total current liabilities	38,671
Operating lease liabilities, net of current portion	5,889
Due to affiliates	142,086
Asset retirement obligation	26
Deferred tax liabilities, net	25,064
Other long-term liabilities	11
Total liabilities	211,747
Total stockholders' equity	156,179
Total liabilities and stockholders' equity	367,926
Eliminations
Current assets:
Investment in subsidiary	(262,735)
Total current assets	(262,735)
Due from affiliates	(169,259)
Total assets	(431,994)
Current liabilities:
Due to affiliates	(169,259)
Total liabilities	(169,259)
Total stockholders' equity	(262,735)
Total liabilities and stockholders' equity	$ (431,994)