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Goodwill - Additional Information (Detail) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2008
Goodwill [Line Items]        
Goodwill impairment charge $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss  
Goodwill, gross 33,600,000us-gaap_GoodwillGross      
Marine Components        
Goodwill [Line Items]        
Goodwill impairment charge       $ 9,900,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cix_MarineComponentsMember