Debt, Average Outstanding Amount

No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Debt Instrument, Restrictive Covenants, Disposition Limitation with Exceptions

+ References

No definition available.

+ Details

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Namespace Prefix:	cvo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_Termloanfacilitydue2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorSubordinatedNotesMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_A8875SeniorSecondLienNotesDue2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_A6.000SeniorSecuredPriorityNotesDue2019Member
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_JuniorSubordinatedDebtMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_A8.500JuniorSecuredPriorityNotesDue2022Member
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_ABLRevolvingCreditFacilityDue2021Member
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- Details

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Long-Term Debt (Narrative) (Details) - USD ($)		12 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Jan. 19, 2016	Dec. 31, 2016	Jan. 02, 2016	Jan. 30, 2015	Jun. 26, 2014	Dec. 11, 2013	Apr. 16, 2013
Debt Instrument [Line Items]
Long-term debt, fair value		$ 881,700,000	$ 895,700,000
Debt, average outstanding amount		$ 1,100,000,000	$ 1,200,000,000
Debt, weighted average interest rate (percent)		6.80%	7.20%
Unamortized debt issuance costs		$ 18,100,000	$ 16,500,000
Long-term debt [Member] \| Term loan facility due 2017 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount							$ 360,000,000
Long-term debt, outstanding principal amount					$ 327,300,000
Senior subordinated notes [Member] \| 8.875% senior second lien notes due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, outstanding principal amount					400,000,000
Senior notes [Member] \| 6.000% senior secured priority notes due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					540,000,000
Long-term debt, outstanding principal amount		540,000,000	540,000,000
Unamortized debt issuance costs		6,500,000			14,700,000
Debt, unamortized discount		3,300,000			5,900,000
Junior subordinated debt [Member] \| 8.500% junior secured priority notes due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount					250,000,000
Long-term debt, outstanding principal amount		241,000,000	248,000,000
Unamortized debt issuance costs		4,200,000			7,100,000
Debt, unamortized discount		2,000,000			$ 2,800,000
Asset based lending facility [Member] \| ABL Facility due 2021 [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs		3,600,000	$ 2,400,000	$ 1,300,000		$ 300,000
Debt, disposition limitation with exceptions		$ 35,000,000
Packaging Business [Member]
Debt Instrument [Line Items]
Proceeds from sale of discontinued operations	$ 89,600,000