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Investments - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]      
Termination of Tianqi Lithium Corporation option agreement $ 13,100 $ 0  
Windfield Holdings      
Schedule of Investments [Line Items]      
Equity method investment, ownership percentage   49.00%  
Carrying value of unconsolidated investment   $ 332,600 $ 288,600
Other variable interest entities      
Schedule of Investments [Line Items]      
Carrying value of unconsolidated investment   $ 8,100 $ 8,800
Rockwood Lithium GmbH      
Schedule of Investments [Line Items]      
Ownership percentage 100.00%    
Minimum | Rockwood Lithium GmbH      
Schedule of Investments [Line Items]      
Ownership percentage   20.00%  
Maximum | Rockwood Lithium GmbH      
Schedule of Investments [Line Items]      
Ownership percentage   30.00%