Goodwill and Other Intangible Assets Intangible assets with determinable lives (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 28, 2013	Dec. 29, 2012
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life	12 years 0 months
Gross Carrying Amount	$ 190,229	$ 184,035
Accumulated Impairment Charges	(27,234)	(27,234)
Accumulated Amortization	(78,269)	(71,342)
Net Carrying Amount	84,726	85,459
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	331,969	325,775
Accumulated Impairment Charges	(49,234)	(49,234)
Accumulated Amortization	(78,269)	(71,342)
Net Carrying Amount	204,466	205,199
Trademarks [Member]
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Gross Carrying Amount	141,740	141,740
Accumulated Impairment Charges	(22,000)	(22,000)
Net Carrying Amount	119,740	119,740
Customer Relationships [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life	9 years 0 months
Gross Carrying Amount	161,919	159,296
Accumulated Impairment Charges	(27,234)	(27,234)
Accumulated Amortization	(68,561)	(62,055)
Net Carrying Amount	66,124	70,007
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life	23 years 0 months
Gross Carrying Amount	20,914	20,701
Accumulated Impairment Charges	0	0
Accumulated Amortization	(6,579)	(5,938)
Net Carrying Amount	14,335	14,763
Off-Market Favorable Lease [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life	20 years 0 months
Gross Carrying Amount	3,728	0
Accumulated Impairment Charges	0	0
Accumulated Amortization	0	0
Net Carrying Amount	3,728	0
Patents [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life	10 years 0 months
Gross Carrying Amount	3,528	3,528
Accumulated Impairment Charges	0	0
Accumulated Amortization	(2,989)	(2,839)
Net Carrying Amount	539	689
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Abstract]
Finite-Lived Intangible Asset, Useful Life
Gross Carrying Amount	140	510
Accumulated Impairment Charges	0	0
Accumulated Amortization	(140)	(510)
Net Carrying Amount	$ 0	$ 0

Accumulated impairment charges of impaired intangible assets (finite only)

No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

Accumulated Impairment Charges of Indefinite Lived Intangible Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	cvo_
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- Definition

Indefinite-Lived Intangible Assets, Gross Amount (before impairment)

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Intangible Assets, Accumulated Amortization (Excluding Goodwill) of both finite-lived and indefinite-lived intangible assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Intangible Assets, Accumulated Impairment Charges (Excluding Goodwill) of both finite-lived and indefinite-lived intangible assets

+ References

No definition available.

+ Details

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Namespace Prefix:	cvo_
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Balance Type:	credit
Period Type:	instant

- Definition

Intangible Assets, Gross (Excluding Goodwill), (includes the gross amount of both finite-lived and indefinite-lived Intangible assets)

+ References

No definition available.

+ Details

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

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount of assets (excluding financial assets) that lack physical substance, excluding goodwill, having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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Balance Type:	na
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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 42, 45

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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