Financing Arrangements - Additional Information (Detail) (USD $)				1 Months Ended			1 Months Ended							1 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended
	Jul. 26, 2013	Jun. 30, 2013	Apr. 26, 2013	Dec. 31, 2012 Revolving Credit Facility Extension	Dec. 21, 2012 Revolving Credit Facility Minimum	Dec. 21, 2012 Revolving Credit Facility Maximum	Dec. 31, 2012 Revolving Credit Facility Maximum Leverage Ratio	Dec. 31, 2012 Revolving Credit Facility Minimum Interest Coverage Ratio	Dec. 31, 2012 Revolving Credit Facility Foreign Currency Sub Facility	Dec. 31, 2012 Revolving Credit Facility Letter Of Credit Sub Facility	Dec. 31, 2012 Revolving Credit Facility Swingline Subfacility	Jul. 26, 2013 Warrant	Apr. 26, 2013 Warrant	Jun. 10, 2008 Convertible Notes Payable	Jul. 26, 2013 Convertible Notes Payable	Apr. 26, 2013 Convertible Notes Payable	Jun. 10, 2008 Convertible Notes Payable Equity Component	Jul. 26, 2013 Senior Notes
Debt Disclosure [Line Items]
Interest expense																		$ 6,300,000
Note repurchase price, percentage of principal amount of notes																		101.00%
Notes issued, principal amount	1,000,000,000		2,264,900,000											1,265,000,000	0	1,264,900,000
Notes issued, interest rate														1.75%
Convertible Notes, maturity date															Jun. 01, 2013
Conversion price of notes to shares of common stock															$ 31.85
Common stock shares issued for excess conversion value															4,900,000
Numerator of common stock ratio for convertible notes															31.40
Denominator of principal amount upon which conversion rate is based															1,000
Excess conversion value over principal amount of Convertible Notes															178,900,000
Convertible Notes														1,017,000,000
Effective interest rate														6.31%		6.31%
Notes issued, issuance discount	5,200,000		12,500,000											248,000,000
Issuance costs on Convertible Notes														21,400,000			5,200,000
Convertible Note Hedge number of shares contracted to sell			31,800,000
Convertible Note Hedge Exercise Price			$ 31.85
Shares received in exercise of convertible note hedge		3,900,000
Outstanding warrants, number of shares												39,900,000	39,700,000
Exercise price of warrants												41.12	41.28
Credit facility, amount				250,000,000					100,000,000	50,000,000	10,000,000
Credit facility, term				5 years
Credit facility, increase in facility				$ 100,000,000
Credit facility, number of extensions				2
Credit facility, extensions period				1 year
Credit facility, base rate					0.20%	1.20%
Credit facility, date terminate				Dec. 21, 2017
Covenant Terms							3.0 :1.0	3.5: 1.0