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Divestitures - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 14, 2016
Feb. 01, 2016
Jan. 04, 2016
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Cash proceeds from divestitures, net                   $ 6,857 $ 3,325,571 $ 8,883
Amounts reclassified from accumulated other comprehensive income                   (2,019) (84,371) (2,144)
Actuarial (losses) gains       $ 11,400   $ (26,700)            
Gain (loss) on sales of businesses, net           0 $ 0 $ 974 $ 121,324 0 122,298 0
Chemetall Surface Treatment                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Cash proceeds from divestitures, net $ 3,100,000                      
Gain on sale of business, before income taxes                     (387,980) 0
Gain on sale of business, net of tax           $ 135,000            
Working capital settlement         $ 6,900             7,600
Actuarial (losses) gains                     (8,500) $ 8,900
Tax expense on gain on sale of business                     253,000  
Gain (loss) on sales of businesses, net                   $ 257,000    
Metal Sulfides Business                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Cash proceeds from divestitures, net     $ 137,000                  
Gain (loss) on sales of businesses, net                     11,500  
Mineral Flame Retardants and Specialty Chemicals Businesses                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Cash proceeds from divestitures, net   $ 187,000                    
Gain (loss) on sales of businesses, net                     $ 112,300  
Magnifin Magnesiaprodukte GmbH & Co. KG                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Ownership percentage   50.00%   0.00%   0.00%       0.00% 0.00% 50.00%
Corporate | Wafer Reclaim                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Gain (loss) on sales of businesses, net                     $ (1,500)  
Foreign Currency Translation                        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                        
Amounts reclassified from accumulated other comprehensive income                   $ 0 $ (81,421) $ (27)