Cross Medical - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Installment
Guarantees And Letters Of Credit [Line Items]
Initial payment towards settlement	$ 5
Cash obligations	18
Cash obligations 2012	7
Cash obligations 2013	4
Cash obligations 2014	4
Cash obligations 2015	3
Number of quarterly payments	13
Thirteen quarterly payments [Member]
Guarantees And Letters Of Credit [Line Items]
Initial payment towards settlement	$ 1