Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended			6 Months Ended			6 Months Ended		36 Months Ended
	Jun. 30, 2014 Vendor LegalMatter	Dec. 31, 2013 LegalMatter	Dec. 31, 2012 LegalMatter	Jun. 30, 2014 Single Incident	Jun. 30, 2013 Single Incident	Dec. 31, 2013 Single Incident	Jun. 30, 2014 Uninsured Cumulative Trauma	Jun. 30, 2013 Uninsured Cumulative Trauma	Dec. 31, 2013 Cumulative Trauma
Loss Contingencies [Line Items]
Reserves for product liability claims				$ 4.5		$ 4.0
Number of lawsuits	2,924	2,840	2,609
Number of insurance carriers	20
Increase in insurance settlements receivable	20.4
Insurance receivables	145.2	124.8	130.0
Insurance receivables, current	2.0
Insurance receivables, noncurrent	143.2
Product liability expense				$ 0.6	$ 0.6		$ 2.2	$ 0.9	$ 104.2