| Document and Entity Information | Jan. 21, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 21, 2021 |
| Entity Registrant Name | VERRA MOBILITY CORPORATION |
| Entity Central Index Key | 0001682745 |
| Entity Emerging Growth Company | false |
| Entity File Number | 1-37979 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 81-3563824 |
| Entity Address, Address Line One | 1150 N. Alma School Road |
| Entity Address, City or Town | Mesa |
| Entity Address, State or Province | AZ |
| Entity Address, Postal Zip Code | 85201 |
| City Area Code | 480 |
| Local Phone Number | 443-7000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | VRRM |
| Security Exchange Name | NASDAQ |
