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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Goodwill and Intangible Assets Disclosure [Abstract] |  |
Intangible assets, gross (excluding goodwill), fully amortized |  | $ 8.5
Weighted average useful like for intangible assets (in years) | 12 years 2 months 12 days |

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Intangible Assets, Gross (Excluding Goodwill), Fully Amortized + References No definition available. + Details
Name: | vsec_IntangibleAssetsGrossExcludingGoodwillFullyAmortized
Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant