Contingencies - Additional Information (Detail) (USD $)	6 Months Ended	35 Months Ended	6 Months Ended				0 Months Ended				4 Months Ended	18 Months Ended	50 Months Ended	10 Months Ended	0 Months Ended			6 Months Ended		0 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Antitrust Lawsuits Defendant	Jun. 30, 2013 Antitrust Lawsuits Canada Defendant class_action_case	Jun. 30, 2013 Antitrust Lawsuits Punitive Damages Canada	Jun. 30, 2013 Antitrust Lawsuits Direct Purchaser Class Action Cases direct_purchaser_class_action_case	Jun. 30, 2013 Antitrust Lawsuits Individual Direct Purchaser Cases direct_purchaser_class_action_case	Jun. 21, 2013 Brazilian Value- Added Tax Matters	Feb. 01, 2013 Brazilian Value- Added Tax Matters	Dec. 17, 2012 Brazilian Value- Added Tax Matters	Dec. 18, 2012 Brazilian Value- Added Tax Matters	Sep. 30, 2012 Brazilian Value- Added Tax Matters	Jun. 30, 2013 Brazilian Value- Added Tax Matters	Jun. 30, 2013 Brazilian Value- Added Tax Matters	Nov. 05, 2012 Brazilian Value- Added Tax Matters Tax Credit Matters	Feb. 14, 2013 Patent Infringement Claim	Feb. 01, 2013 Patent Infringement Claim	Jan. 24, 2012 Patent Infringement Claim patent	Jun. 30, 2013 Patent Infringement Claim	Feb. 15, 2013 Patent Infringement Claim	Jul. 03, 2013 Patent Infringement Claim Subsequent Event
Commitments And Contingencies [Line Items]
Charges against earnings	$ 0
Number of defendants		20	13
Named as a defendant in pending cases			2		3	38
General and special damages			100,000,000	10,000,000			2,800,000	200,000	5,800,000	600,000	2,100,000	3,300,000	2,500,000	2,000,000			5,000,000
Number of patents infringed																	3
Alleged damages amount																		16,200,000
Damages awarded															5,000,000
Post-verdict royalties requested																			2,000,000
Pre-judgment interest requested																700,000
Pre-judgment interest awarded																				$ 500,000
Patents found not infringed upon																	1