Inventories - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Inventory [Line Items]
Amounts charged for excess obsolete inventory	$ 52.5	$ 92.9
Amounts charged for affected inventory and instruments	39.1
Inventory [Member]
Inventory [Line Items]
Amounts charged for affected inventory and instruments	36.2
Instrument [Member]
Inventory [Line Items]
Amounts charged for affected inventory and instruments	$ 2.9