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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Leases, Rent, Net [Abstract] |  |  |
Operating Lease Expense | $ 5,100 | $ 5,824 | $ 6,576
Sublease Income | 888 | 506 | 119
Net Expense | 4,212 | $ 5,318 | $ 6,457
Lease Commitments |  |  |
2017 | 3,504 |  |
2018 | 2,038 |  |
2019 | 837 |  |
2020 | 312 |  |
2021 | 114 |  |
Thereafter | 5 |  |
Total | 6,810 |  |
Sublease Income |  |  |
2017 | 0 |  |
2018 | 0 |  |
2019 | 0 |  |
2020 | 0 |  |
2021 | 0 |  |
Thereafter | 0 |  |
Total | 0 |  |
Net Commitments |  |  |
2017 | 3,504 |  |
2018 | 2,038 |  |
2019 | 837 |  |
2020 | 312 |  |
2021 | 114 |  |
Thereafter | 5 |  |
Total | 6,810 |  |
Lease Commitments Under Headquarters Lease |  |  |
2017 | 4,220 |  |
2018 | 4,337 |  |
2019 | 4,456 |  |
2020 | 4,579 |  |
2021 | 4,705 |  |
Thereafter | 27,163 |  |
Total | 49,460 |  |
Sublease Income Under Headquarters Lease |  |  |
2017 | 843 |  |
2018 | 396 |  |
2019 | 376 |  |
2020 | 0 |  |
2021 | 0 |  |
Thereafter | 0 |  |
Total | 1,615 |  |
Net Commitments Under Headquarters Lease |  |  |
2017 | 3,377 |  |
2018 | 3,941 |  |
2019 | 4,080 |  |
2020 | 4,579 |  |
2021 | 4,705 |  |
Thereafter | 27,163 |  |
Total | $ 47,845 |  |

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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 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
Name: | vsec_CapitalLeasesFutureMinimumPaymentsNetCommitmentsDueInYearTwo
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
Name: | vsec_CapitalLeasesFutureMinimumPaymentsNetCommitmentsDueThereafter
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
Name: | vsec_CapitalLeasesFutureMinimumPaymentsNetCommitmentsDueTotal
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
Name: | vsec_OperatingLeasesFutureMinimumPaymentsNetCommitments
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
Period Type: | duration

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
Balance Type: | credit
Period Type: | instant

X
- 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
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 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
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 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
Balance Type: | credit
Period Type: | instant

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- 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
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
Name: | vsec_OperatingLeasesFutureMinimumPaymentsNetCommitmentsDueTotal
Namespace Prefix: | vsec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant