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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Leases, Rent, Net [Abstract] |  |  |
Operating Lease Expense | $ 3,363 | $ 4,924 | $ 5,100
Sublease Income | 1,198 | 1,134 | 888
Net Expense | 2,165 | $ 3,790 | $ 4,212
Lease Commitments |  |  |
2019 | 2,527 |  |
2020 | 1,479 |  |
2021 | 1,270 |  |
2022 | 1,189 |  |
2023 | 898 |  |
Thereafter | 167 |  |
Total | 7,530 |  |
Sublease Income |  |  |
2019 | 0 |  |
2020 | 0 |  |
2021 | 0 |  |
2022 | 0 |  |
2023 | 0 |  |
Thereafter | 0 |  |
Total | 0 |  |
Net Commitments |  |  |
2019 | 2,527 |  |
2020 | 1,479 |  |
2021 | 1,270 |  |
2022 | 1,189 |  |
2023 | 898 |  |
Thereafter | 167 |  |
Total | 7,530 |  |
Lease Commitments Under Headquarters Lease |  |  |
2019 | 4,456 |  |
2020 | 4,579 |  |
2021 | 4,705 |  |
2022 | 4,827 |  |
2023 | 4,948 |  |
Thereafter | 17,388 |  |
Total | 40,903 |  |
Sublease Income Under Headquarters Lease |  |  |
2019 | 376 |  |
2020 | 0 |  |
2021 | 0 |  |
2022 | 0 |  |
2023 | 0 |  |
Thereafter | 0 |  |
Total | 376 |  |
Net Commitments Under Headquarters Lease |  |  |
2019 | 4,080 |  |
2020 | 4,579 |  |
2021 | 4,705 |  |
2022 | 4,827 |  |
2023 | 4,948 |  |
Thereafter | 17,388 |  |
Total | $ 40,527 |  |

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- Definition Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for capital leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for capital leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for capital leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for capital leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income having an initial or remaining non-cancelable letter-terms in excess of one year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing in the next fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Definition Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income maturing after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of sublease income having an initial or remaining non-cancelable letter-terms in excess of one year. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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