Commitments and Contingencies Activity in Recorded Environmental Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of period	$ 9,235
Expenditures	(975)
Accretion of discount	111
Revisions of estimates	8
Foreign currency translation	(2,426)
Balance at end of period	37,344
Less amounts reported in Accrued expenses	5,009
Amounts reported in Other noncurrent liabilities	32,335
Rockwood Holdings, Inc.
Accrual for Environmental Loss Contingencies [Roll Forward]
Acquisition of Rockwood	$ 31,391