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Stock-Based Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 02, 2013 | Mar. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for issuance (in shares) | 278,482 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |  |
Stock-based compensation expense | $ 1,614 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,576 us-gaap_AllocatedShareBasedCompensationExpense | $ 922 us-gaap_AllocatedShareBasedCompensationExpense |  |
Stock-based compensation cost, net | 1,739 us-gaap_ShareBasedCompensation | 1,576 us-gaap_ShareBasedCompensation | 1,076 us-gaap_ShareBasedCompensation |  |
Tax withholding associated with awards issued | 314 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | 257 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | 332 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation |  |
Compensation expense not yet recognized | 764 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions |  |  |  |
Weighted average amortization period of compensation not yet recognized | 1 year 9 months 18 days |  |  |  |
Compensation expense related to these grants | 1,614 us-gaap_AllocatedShareBasedCompensationExpense | 1,576 us-gaap_AllocatedShareBasedCompensationExpense | 922 us-gaap_AllocatedShareBasedCompensationExpense |  |
Total stock-based compensation expense, net of income tax | 1,739 us-gaap_ShareBasedCompensation | 1,576 us-gaap_ShareBasedCompensation | 1,076 us-gaap_ShareBasedCompensation |  |
Contract Costs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation cost, net | 1,070 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 970 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 662 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |
Stock-based compensation expense | 1,739 us-gaap_RestrictedStockExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 1,576 us-gaap_RestrictedStockExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 1,076 us-gaap_RestrictedStockExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |
Income tax benefit recognized for stock-based compensation | (669)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (606)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | (414)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |
Total stock-based compensation expense, net of income tax | 1,070 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 970 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 662 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |
Non-employee Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 510 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 413 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 272 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |
Compensation expense related to these grants | 510 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 413 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 272 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |
Employee [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 1,104 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember | 1,163 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember | 650 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember |  |
Compensation expense related to these grants | 1,104 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember | 1,163 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember | 650 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember |  |
2006 Restricted Stock Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares authorized (in shares) | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember |  |  |  |
2006 Restricted Stock Plan [Member] | Non-employee Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock awarded (in shares) | 10,800 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 16,100 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |
Grant date fair value (in dollars per share) |  | $ 25.68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  | $ 47.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |
Stock-based compensation expense | 510 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 413 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |
Compensation expense related to these grants | $ 510 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | $ 413 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |
2006 Restricted Stock Plan [Member] | Employee [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock awarded (in shares) | 12,221 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember |  |  |  |
Grant date fair value (in dollars per share) |  |  |  |  | $ 47.07 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember
Vesting period | 3 years |  |  |  |
Vested award is paid in our shares |  |  |  |  | 100.00%vsec_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPercentage / us-gaap_PlanNameAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = us-gaap_EmployeeStockMember

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- Definition The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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