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Business Segments and Customer Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable operating segments |  |  |  |  |  |  |  |  | 4 us-gaap_NumberOfOperatingSegments |  |
Revenues |  |  |  |  |  |  |  |  | $ 424,071 us-gaap_Revenues | $ 471,638 us-gaap_Revenues | $ 546,755 us-gaap_Revenues
Operating income | 7,687 us-gaap_OperatingIncomeLoss | 7,183 us-gaap_OperatingIncomeLoss | 10,703 us-gaap_OperatingIncomeLoss | 11,357 us-gaap_OperatingIncomeLoss | 12,000 us-gaap_OperatingIncomeLoss | 9,460 us-gaap_OperatingIncomeLoss | 12,701 us-gaap_OperatingIncomeLoss | 9,942 us-gaap_OperatingIncomeLoss | 36,930 us-gaap_OperatingIncomeLoss | 44,103 us-gaap_OperatingIncomeLoss | 51,076 us-gaap_OperatingIncomeLoss
Interest (income) expense, net |  |  |  |  |  |  |  |  | 3,983 us-gaap_InterestIncomeExpenseNet | 5,789 us-gaap_InterestIncomeExpenseNet | 7,224 us-gaap_InterestIncomeExpenseNet
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 18,770 vsec_DepreciationAndAmortizationExpense | 20,008 vsec_DepreciationAndAmortizationExpense | 19,795 vsec_DepreciationAndAmortizationExpense
Capital expenditures |  |  |  |  |  |  |  |  | 3,414 us-gaap_PaymentsToAcquireProductiveAssets | 4,416 us-gaap_PaymentsToAcquireProductiveAssets | 20,863 us-gaap_PaymentsToAcquireProductiveAssets
Total assets | 355,330 us-gaap_Assets |  |  |  | 380,529 us-gaap_Assets |  |  |  | 355,330 us-gaap_Assets | 380,529 us-gaap_Assets |
Supply Chain Management Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 172,482 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 154,702 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 143,014 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember
Operating income |  |  |  |  |  |  |  |  | 29,694 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 27,299 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 24,014 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 5,373 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 4,265 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 9,891 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember
Capital expenditures |  |  |  |  |  |  |  |  | 2,524 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 895 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 341 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember
Total assets | 192,720 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember |  |  |  | 185,976 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember |  |  |  | 192,720 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember | 185,976 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_SupplyChainManagementGroupMember |
International Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 106,369 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 146,908 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 167,193 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember
Operating income |  |  |  |  |  |  |  |  | 3,795 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 7,069 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 6,052 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 5,713 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 7,323 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 3,035 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember
Capital expenditures |  |  |  |  |  |  |  |  | 0 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 236 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 83 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember
Total assets | 17,235 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember |  |  |  | 33,355 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember |  |  |  | 17,235 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember | 33,355 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_InternationalGroupMember |
Federal Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 84,392 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 95,435 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 142,323 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember
Operating income |  |  |  |  |  |  |  |  | (343)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 2,400 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 10,418 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 5,607 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 6,033 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 3,116 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember
Capital expenditures |  |  |  |  |  |  |  |  | 230 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 1,211 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 763 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember
Total assets | 18,990 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember |  |  |  | 20,846 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember |  |  |  | 18,990 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember | 20,846 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_FederalGroupMember |
IT, Energy and Management Consulting Group [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 60,828 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 74,593 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 94,225 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember
Operating income |  |  |  |  |  |  |  |  | 6,634 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 9,061 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 11,816 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 2,077 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 2,387 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 3,753 vsec_DepreciationAndAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember
Capital expenditures |  |  |  |  |  |  |  |  | 199 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 71 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 53 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember
Total assets | 49,790 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember |  |  |  | 57,610 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember |  |  |  | 49,790 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember | 57,610 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_ItEnergyAndManagementConsultingGroupMember |
Corporate/unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (2,850)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember | (1,726)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember | (1,224)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember
Capital expenditures |  |  |  |  |  |  |  |  | 461 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember | 2,003 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember | 19,623 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember
Total assets | $ 76,595 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember |  |  |  | $ 82,742 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember |  |  |  | $ 76,595 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember | $ 82,742 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vsec_CorporateUnallocatedMember |

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