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Segment and Geographic Area Information Summarized Financial Information by Reportable Segments (Footnote) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 01, 2017
Jan. 12, 2015
Segment Reporting Information [Line Items]          
Restructuring and other, net $ 0 $ 0 $ (6,804)    
Loss on extinguishment of debt (52,801) (1,921) (5,353)    
Cost of sales          
Segment Reporting Information [Line Items]          
Restructuring and other, net 2,900        
Reversal of a liability from an abandoned project 1,300        
Research and development expenses          
Segment Reporting Information [Line Items]          
Restructuring and other, net 5,700        
Write-off of fixed assets   1,400      
Selling, general and administrative expenses          
Segment Reporting Information [Line Items]          
Restructuring and other, net 8,400        
Reversal of purchase accounting accrual 1,000        
Net gain (loss) on sales of properties   (900)      
Other (expenses) income, net          
Segment Reporting Information [Line Items]          
Asset retirement obligation charges 3,200        
Net gain (loss) on sales of properties (4,100) 1,100      
Revision of tax indemnification expense 3,700        
Settlement of a legal claim 1,000        
Reversal of a liability from previous acquisition 10,600        
Reversal of a liability from previous business 1,100        
Environmental charges   2,400      
Jiangxi Jiangli New Materials Science and Technology Co. Ltd.          
Segment Reporting Information [Line Items]          
Inventory markup 23,100        
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Cost of sales          
Segment Reporting Information [Line Items]          
Utilization of inventory markup $ 23,100        
Sales de Magnesio Ltda.          
Segment Reporting Information [Line Items]          
Percentage of equity interests acquired       50.00%  
Rockwood Holdings, Inc.          
Segment Reporting Information [Line Items]          
Inventory markup         $ 103,400
Utilization of inventory markup   $ 103,400      
Rockwood Holdings, Inc. | Cost of sales          
Segment Reporting Information [Line Items]          
Utilization of inventory markup     55,900    
Rockwood Holdings, Inc. | Equity in net income of unconsolidated investments          
Segment Reporting Information [Line Items]          
Utilization of inventory markup     27,100    
Refining Solutions | Fabrica Carioca de Catalisadores S.A.          
Segment Reporting Information [Line Items]          
Unconsolidated investment impairment charges     2,000    
Corporate | Rockwood Holdings, Inc.          
Segment Reporting Information [Line Items]          
Acquisition financing-related fees     4,400    
Phosphorus Flame Retardant Business Exit          
Segment Reporting Information [Line Items]          
Exit of phosphorus flame retardants business     $ 6,800