Contingencies - Summary of Cumulative Trauma Product Liability Claims Activity (Detail) - LegalMatter	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingency, Quantities [Roll Forward]
Open lawsuits, January 1	2,326	2,840	2,609
New lawsuits	340	542	489
Settled and dismissed lawsuits	(678)	(1,056)	(258)
Open lawsuits, December 31	1,988	2,326	2,840