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Acquisitions (Narrative) (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Sep. 16, 2013
employee
Business Acquisition [Line Items]      
Acquisition related costs $ 300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 1,900,000us-gaap_BusinessCombinationAcquisitionRelatedCosts  
National Envelope Acquisition [Member]      
Business Acquisition [Line Items]      
Number of employees (employee)     1,600dei_EntityNumberOfEmployees
/ us-gaap_BusinessAcquisitionAxis
= cvo_NationalEnvelopeAcquisitionMember
Acquisition purchase price     34,062,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= cvo_NationalEnvelopeAcquisitionMember
Acquistion purchase price, company common stock     6,000,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= cvo_NationalEnvelopeAcquisitionMember
Gain on bargain purchase     17,262,000us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= cvo_NationalEnvelopeAcquisitionMember
Gain on bargain purchase, tax expense     6,800,000cvo_BusinessCombinationBargainPurchaseGainRecognizedTaxExpense
/ us-gaap_BusinessAcquisitionAxis
= cvo_NationalEnvelopeAcquisitionMember
Finite-lived intangible assets     4,430,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cvo_NationalEnvelopeAcquisitionMember
Leasehold interests [Member] | National Envelope Acquisition [Member]      
Business Acquisition [Line Items]      
Finite-lived intangible assets     $ 4,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cvo_NationalEnvelopeAcquisitionMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OffMarketFavorableLeaseMember
Intangible asset, useful life (years)     20 years 0 months