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Commitments and Contingencies - Narrative (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 19, 2018 subcontractor | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Sublease rentals |  |  | $ 2.2 | $ 3.8
Cash payments |  | $ 5.7 |  |
Weighted average remaining lease term |  | 6 years 7 months 18 days |  |
Weighted average discount rate, percent |  | 6.00% |  |
Operating Leases | Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Lease term |  | 2 years |  |
Operating Leases | Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Lease term |  | 15 years |  |
Joseph Waggoner v VSE re Overtime Compensation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of subcontractors named in lawsuit | subcontractor | 2 |  |  |

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