Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended		12 Months Ended	0 Months Ended	3 Months Ended	9 Months Ended
	Sep. 19, 2013 RTI Technologies [Member]	Nov. 09, 2009 RTI Technologies [Member]	Sep. 30, 2013 RTI Technologies [Member]	Jul. 30, 2013 Hospital Plaintiffs [Member]	Jun. 30, 2013 Hospital Plaintiffs [Member]	Jun. 30, 2013 Hospital Plaintiffs [Member]
Loss Contingencies [Line Items]
Settlement amount				$ 22	$ 22	$ 22
Damages awarded	113.5	5.0
Pre-tax charge relating to an unfavorable litigation verdict			$ 341