Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Loss Contingencies [Line Items]
Approximate number of federal district court actions alleged for patent infringement			50
Payments for Legal Settlements		$ 384,000,000		$ 384,000,000
Litigation settlements, payment period	6 years
Future payments for Legal Settlements		$ 200,000,000		$ 200,000,000
Guarantee obligations, year term (in years)			30