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Accounts Receivable, Net - Schedule of Accounts Receivable, Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts	$ (78)us-gaap_AllowanceForDoubtfulAccountsReceivable	$ (128)us-gaap_AllowanceForDoubtfulAccountsReceivable
Accounts receivable, net	8,747us-gaap_AccountsReceivableNetCurrent	8,534us-gaap_AccountsReceivableNetCurrent
Security Products
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable, gross	7,912us-gaap_AccountsReceivableGross / us-gaap_StatementBusinessSegmentsAxis = cix_SecurityProductsMember	7,813us-gaap_AccountsReceivableGross / us-gaap_StatementBusinessSegmentsAxis = cix_SecurityProductsMember
Marine Components
Accounts Notes And Loans Receivable [Line Items]
Accounts receivable, gross	$ 913us-gaap_AccountsReceivableGross / us-gaap_StatementBusinessSegmentsAxis = cix_MarineComponentsMember	$ 849us-gaap_AccountsReceivableGross / us-gaap_StatementBusinessSegmentsAxis = cix_MarineComponentsMember

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- Definition

For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.9)

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ 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 210.5-02.3-4)

-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 3

-Subparagraph a(1)

-Article 5



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



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