Summary of Cumulative Trauma Product Liability Claims Activity (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2014 LegalMatter	Dec. 31, 2013 LegalMatter
Loss Contingency, Quantities [Roll Forward]
Open claims, beginning of period	2,840	2,609
New claims	123	489
Settled and dismissed claims	(62)	(258)
Open claims, end of period	2,901	2,840