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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
Statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Valuation allowance   $ 24us-gaap_DeferredTaxAssetsValuationAllowance  
Income Tax Valuation Allowance      
Income Taxes [Line Items]      
Income tax attributable to continuing operations $ 24us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= cix_IncomeTaxValuationAllowanceMember
$ 102us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= cix_IncomeTaxValuationAllowanceMember
317us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= cix_IncomeTaxValuationAllowanceMember