Pension Plans and Other Postretirement Benefits - Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended					9 Months Ended
	Sep. 30, 2014		Mar. 31, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Total net pension benefits cost	$ 4,029				$ 1,578	$ 21,946		$ 4,730
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,678				3,488	8,245		10,462
Interest cost	8,006				7,470	24,303		22,403
Expected return on assets	(10,027)				(9,848)	(30,404)		(29,541)
Actuarial loss	2,786	[1]	15,400	[1]	0	18,218	[1]	0
Amortization of prior service benefit	(119)				(173)	(530)		(517)
Total net pension benefits cost	3,324				937	19,832		2,807
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	54				78	162		232
Interest cost	760				691	2,280		2,073
Expected return on assets	(85)				(104)	(256)		(310)
Amortization of prior service benefit	(24)				(24)	(72)		(72)
Total net pension benefits cost	$ 705				$ 641	$ 2,114		$ 1,923

[1] In connection with the announced realignment of our operating segments effective January 1, 2014, in the fourth quarter of 2013 we initiated a workforce reduction plan which will result in a reduction of approximately 230 employees worldwide. This workforce reduction triggered a net curtailment gain of approximately $0.8 million in the first quarter of 2014 for our U.S. defined benefit plan which covers non-represented employees and our supplemental executive retirement plan (SERP). In connection with the curtailment, we were required to remeasure the related assets and obligations for these two plans. As of the January 31, 2014 remeasurement date, the weighted-average discount rate for all of our domestic pension plans was 4.97% compared to 5.14% at December 31, 2013. Taking into account the discount rate reduction and actual return on plan assets through January 31, 2014, we recorded a mark-to-market actuarial loss (net of the curtailment gain) of $15.4 million in the first quarter of 2014 related to these two plans.In connection with the sale of our antioxidant, ibuprofen and propofol businesses and assets to SI Group, Inc. which closed on September 1, 2014, in the third quarter of 2014 we were required to remeasure the assets and obligations of one of our U.S. defined benefit plans for represented employees, which was part of the disposed group. As of the September 1, 2014 remeasurement date, the weighted-average discount rate for all of our domestic pension plans was 4.94% compared to 5.14% at December 31, 2013. Taking into account the discount rate reduction and actual return on plan assets through September 1, 2014, as well as changes to mortality assumptions, we recorded a mark-to-market actuarial loss of $2.8 million in the third quarter of 2014 related to this plan.