Class of Warrant or Right, Percentage of Common Stock Outstanding

No definition available.

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- Definition

Debt Exchange, Amount Exchanged

+ References

No definition available.

+ Details

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

- Definition

Debt Exchange, Assumed Participation

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Debt Exchange, Rate

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Line of Credit Facility, Borrowing Capacity, Reduction

+ References

No definition available.

+ Details

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

- Definition

Long-term Debt, Percentage Owned by Third Party

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Warrants, Amount Issued per Debt Exchange

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- 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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Namespace Prefix:	us-gaap_
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

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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

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Period Type:	duration

- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_A115SeniorNotesDue2017Member
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_A7SeniorExchangeableNotesDue2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	cvo_DebtTransactionsAxis=cvo_ExchangeOfferMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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Data Type:	na
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- Details

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- Details

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- Details

Name:	cvo_DebtTransactionsAxis=cvo_SupportAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=cvo_SupportingNoteholdersMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	cvo_DebtTransactionsAxis=cvo_ABLAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	cvo_DebtTransactionsAxis=cvo_SecuredNotePurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_DebtInstrumentAxis=cvo_NewSecuredNoteMember
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Data Type:	na
Balance Type:
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- Details

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- Details

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- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Long-Term Debt (Subsequent Event) (Details)	May. 10, 2016 USD ($) shares $ / shares	Apr. 02, 2016 USD ($)	Jan. 02, 2016 USD ($)
Senior unsecured debt [Member] \| 11.5% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, outstanding principal amount		$ 189,700,000	$ 199,700,000
Convertible debt [Member] \| 7% senior exchangeable notes due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, outstanding principal amount		$ 48,700,000	$ 83,300,000
Exchange Offer [Member] \| Subsequent Event [Member] \| Senior unsecured debt [Member] \| 11.5% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Warrants, percentage of common stock outstanding (percent)	16.60%
Warrants, exercise price (dollar per share) \| $ / shares	$ 1.50
Debt instrument, face amount	$ 1,000
Debt exchange, amount exchanged per face amount	$ 700
Debt exchange, assumed participation (percentage)	100.00%
Exchange Offer [Member] \| Subsequent Event [Member] \| Minimum [Member] \| Senior unsecured debt [Member] \| 11.5% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Warrants, amount issued per debt face amount \| shares	59
Exchange Offer [Member] \| Subsequent Event [Member] \| Maximum [Member] \| Senior unsecured debt [Member] \| 11.5% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Warrants, amount issued per debt face amount \| shares	75
Support Agreement [Member] \| Subsequent Event [Member] \| Supporting Noteholders [Member] \| Senior unsecured debt [Member] \| 11.5% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, outstanding principal amount	$ 145,800,000
Debt, percentage owned by third party (percent)	76.80%
ABL Amendment [Member] \| Subsequent Event [Member] \| Asset based lending facility [Member] \| ABL Facility due 2017 [Member]
Debt Instrument [Line Items]
Credit Facility, decrease in borrowing capacity	$ 50,000,000
Secured Note Purchase Agreement [Member] \| Subsequent Event [Member] \| Secured debt [Member] \| New Secured Note [Member]
Debt Instrument [Line Items]
Long-term debt, outstanding principal amount	50,000,000
Affiliate Exchange Agreement [Member] \| Subsequent Event [Member] \| Affiliates [Member] \| Senior unsecured debt [Member] \| 11.5% senior notes due 2017 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	1,000
Debt exchange, amount exchanged per face amount	700
Long-term debt, outstanding principal amount	$ 4,200,000
Debt, percentage owned by third party (percent)	2.20%
Allianz 7% Notes Purchase Agreement [Member] \| Subsequent Event [Member] \| Allianz [Member] \| Convertible debt [Member] \| 7% senior exchangeable notes due 2017 [Member]
Debt Instrument [Line Items]
Warrants, percentage of common stock outstanding (percent)	3.30%
Long-term debt, outstanding principal amount	$ 37,500,000
Debt, percentage owned by third party (percent)	77.00%
Debt Exchange, Rate	0.6