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GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period $ 401,301 $ 397,324
Addition from acquisition 1,084 6,388
Foreign currency translation adjustment 2,523 (2,411)
Gross goodwill at the end of the period 404,908 401,301
Accumulated impairment losses at the end of the period (187,693) (187,693)
Net goodwill at the end of the period 217,215 213,608
Chlorovinyls
   
Goodwill    
Percentage by which estimated fair value exceeds carrying value of reporting unit 10.00%  
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period 242,855 245,266
Foreign currency translation adjustment 2,523 (2,411)
Gross goodwill at the end of the period 245,378 242,855
Accumulated impairment losses at the end of the period (55,487) (55,487)
Net goodwill at the end of the period 189,891 187,368
Building Products
   
Goodwill    
Percentage by which estimated fair value exceeds carrying value of reporting unit 10.00%  
Changes made to goodwill by reportable segment    
Gross goodwill at the beginning of the period 158,446 152,058
Addition from acquisition 1,084 6,388
Gross goodwill at the end of the period 159,530 158,446
Accumulated impairment losses at the end of the period (132,206) (132,206)
Net goodwill at the end of the period $ 27,324 $ 26,240
Window and Door Profiles
   
Goodwill    
Percentage decrease in the annual earnings before interest and tax margin assumption that could result in the carrying value exceeding the fair value 10.00%  
Percentage decrease in terminal multiple assumption that could result in the carrying value exceeding the fair value 10.00%  
Percentage by which estimated fair value exceeds carrying value of reporting unit 10.00%