Operating Segments and Geographic Area Information - Depreciation Amortization and Capital Expenditures by Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Depreciation and amortization:	$ 103,572	$ 107,370	$ 99,020
Capital expenditures:	110,576	155,346	280,873
Performance Chemicals
Segment Reporting Information [Line Items]
Depreciation and amortization:	48,233	43,472	37,831
Capital expenditures:	48,831	94,506	156,648
Catalyst Solutions
Segment Reporting Information [Line Items]
Depreciation and amortization:	49,622	49,656	47,155
Capital expenditures:	61,721	60,326	122,746
Discontinued Operations
Segment Reporting Information [Line Items]
Depreciation and amortization:	3,165	12,054	12,120
Corporate & other
Segment Reporting Information [Line Items]
Depreciation and amortization:	2,552	2,188	1,914
Capital expenditures:	$ 24	$ 514	$ 1,479