Commitments and Contingencies - Information Regarding the Company's Insurance Coverage (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
2004
Product Liability Contingency [Line Items]
Insurance Coverage	$ 2.0
Deductible Amount	0.1
Remaining Insurance Coverage	2.0
2005
Product Liability Contingency [Line Items]
Insurance Coverage	10.0
Deductible Amount	0.3
Remaining Insurance Coverage	7.0
2006
Product Liability Contingency [Line Items]
Insurance Coverage	10.0
Deductible Amount	0.3
Remaining Insurance Coverage	3.7
2007
Product Liability Contingency [Line Items]
Insurance Coverage	10.0
Deductible Amount	0.3
Remaining Insurance Coverage	8.0
2008
Product Liability Contingency [Line Items]
Insurance Coverage	10.0
Deductible Amount	0.5
Remaining Insurance Coverage	0
2009
Product Liability Contingency [Line Items]
Insurance Coverage	10.0
Deductible Amount	1.0
Remaining Insurance Coverage	10.0
2010
Product Liability Contingency [Line Items]
Insurance Coverage	10.0
Deductible Amount	1.0
Remaining Insurance Coverage	10.0
2011
Product Liability Contingency [Line Items]
Insurance Coverage	10.0
Deductible Amount	1.0
Remaining Insurance Coverage	10.0
Jan - Jun 2012
Product Liability Contingency [Line Items]
Insurance Coverage	7.0
Deductible Amount	1.0
Remaining Insurance Coverage	7.0
Jul - Dec 2012
Product Liability Contingency [Line Items]
Insurance Coverage	12.0
Deductible Amount	1.0
Remaining Insurance Coverage	12.0
2013
Product Liability Contingency [Line Items]
Insurance Coverage	12.0
Deductible Amount	1.0
Remaining Insurance Coverage	12.0
2014
Product Liability Contingency [Line Items]
Insurance Coverage	11.0
Deductible Amount	4.0
Remaining Insurance Coverage	11.0
2015
Product Liability Contingency [Line Items]
Insurance Coverage	10.0
Deductible Amount	5.0
Remaining Insurance Coverage	$ 10.0