Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended					9 Months Ended		36 Months Ended
	Sep. 30, 2014 Vendor LegalMatter	Dec. 31, 2013 LegalMatter	Dec. 31, 2012 LegalMatter	Sep. 30, 2014 Single Incident	Dec. 31, 2013 Single Incident	Sep. 30, 2014 Uninsured Cumulative Trauma	Sep. 30, 2013 Uninsured Cumulative Trauma	Dec. 31, 2013 Cumulative Trauma
Loss Contingencies [Line Items]
Reserves for product liability claims				$ 3.5	$ 4.0
Number of lawsuits	3,096	2,840	2,609
Loss contingency, pending claims, de minimus level of activity, period (in years)	5 years
Number of insurance carriers	20
Increase in insurance settlements receivable	22.9
Insurance receivables	147.7	124.8	130.0
Insurance receivables, current	2.0
Insurance receivables, noncurrent	145.7
Product liability expense						$ 2.3	$ 1.4	$ 104.2