XML 32 R1.htm IDEA: XBRL DOCUMENT v2.4.0.6
Document and Entity Information
 9 Months Ended
Sep. 30, 2012
Nov. 05, 2012
Class A common stock
Nov. 05, 2012
Class B common stock
Entity Information [Line Items]      
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Sep. 30, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q3    
Trading Symbol CIX    
Entity Registrant Name COMPX INTERNATIONAL INC    
Entity Central Index Key 0001049606    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   2,392,107 10,000,000