Pension Plans and Other Postretirement Benefits Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Footnote) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014		Dec. 31, 2014	Jan. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Net curtailment gain		$ 800,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	2,600,000
United States Pension Plan of US Entity
Defined Benefit Plan Disclosure [Line Items]
Discount rate				5.14%	4.97%
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ 0	$ 15,432,000	[1]

[1] In connection with a realignment of our operating segments effective January 1, 2014, in the fourth quarter of 2013 we initiated a workforce reduction plan which resulted 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.