Goodwill and Other Intangible Assets Intangible assets with determinable lives (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 29, 2013	Dec. 29, 2012
Finite-Lived Intangible Assets [Abstract]
Intangible asset useful life	12 years
Gross Carrying Amount	$ 197,060	$ 194,109
Accumulated Impairment Charges	(27,234)	(27,234)
Accumulated Amortization	(78,758)	(73,711)
Net Carrying Amount	91,068	93,164
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Amount	338,800	335,849
Accumulated Impairment Charges	(49,234)	(49,234)
Accumulated Amortization	(78,758)	(73,711)
Net Carrying Amount	210,808	212,904
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]
Intangible asset useful life	10 years
Gross Carrying Amount	169,324	166,600
Accumulated Impairment Charges	(27,234)	(27,234)
Accumulated Amortization	(68,249)	(63,772)
Net Carrying Amount	73,841	75,594
Trademarks and tradenames [Member]
Finite-Lived Intangible Assets [Abstract]
Intangible asset useful life	22 years
Gross Carrying Amount	23,698	23,471
Accumulated Impairment Charges	0	0
Accumulated Amortization	(7,060)	(6,590)
Net Carrying Amount	16,638	16,881
Patents [Member]
Finite-Lived Intangible Assets [Abstract]
Intangible asset useful life	9 years
Gross Carrying Amount	3,528	3,528
Accumulated Impairment Charges	0	0
Accumulated Amortization	(2,939)	(2,839)
Net Carrying Amount	589	689
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Abstract]
Intangible asset useful life
Gross Carrying Amount	510	510
Accumulated Impairment Charges	0	0
Accumulated Amortization	(510)	(510)
Net Carrying Amount	$ 0	$ 0

Accumulated impairment charges of impaired intangible assets (finite only)

No definition available.

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- Definition

Accumulated Impairment Charges of Indefinite Lived Intangible Assets

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- 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_
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- 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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- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- 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.

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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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- Definition

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

+ References

+ Details

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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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- 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.

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