Income Taxes Changes in Balance of Deferred Tax Asset Valuation Allowance (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Deferred Tax Asset Valuation Allowance [Roll Forward]
Beginning Balance		$ (84,137)	$ (30,768)		$ (33,757)
Additions		(20,568)	(59,889)	[1]	(1,895)
Deductions		34,805	6,520		4,884
Ending Balance		(69,900)	(84,137)		(30,768)
Income Taxes [Line Items]
Additions related to the acquisition of Rockwood		$ 20,568	59,889	[1]	$ 1,895
Rockwood Holdings, Inc.
Deferred Tax Asset Valuation Allowance [Roll Forward]
Additions	[1]		(42,000)
Income Taxes [Line Items]
Additions related to the acquisition of Rockwood	[1]		$ 42,000

[1] Additions for the year ended December 31, 2015 includes $42.0 million related to the acquisition of Rockwood.