Balance Sheet Details - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 14.2	$ 14.8	$ 13.1
Total amortization expense	$ 9.6	$ 5.1	$ 3.9