Commitments and Contingencies - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Loss Contingencies [Line Items]
Environmental remediation liabilities - discounted	$ 25,700
Environmental remediation liabilities - undiscounted	43,900
Potential revision on future environmental remediation costs before tax	$ 22,000
Minimum
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Discount Rate	2.80%
Maximum
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies, Discount Rate	4.30%
Rockwood Holdings, Inc.
Loss Contingencies [Line Items]
Accrual for Environmental Loss Contingencies from Rockwood Acquisition	$ 35,367