Equity Arrangements - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended			1 Months Ended	9 Months Ended			1 Months Ended	9 Months Ended	1 Months Ended	12 Months Ended
	Oct. 01, 2011	Sep. 29, 2012	Dec. 31, 2011	Nov. 30, 2010	Nov. 30, 2010 Capped call (equity options)	Sep. 29, 2012 Capped call (equity options)	Sep. 29, 2012 Convertible notes payable due in 2018 (junior subordinated)	Dec. 31, 2011 Convertible notes payable due in 2018 (junior subordinated)	Nov. 30, 2010 Maximum Capped call (equity options)	Sep. 29, 2012 Maximum Capped call (equity options)	Nov. 30, 2010 Minimum Capped call (equity options)	Dec. 31, 2011 Convertible Preferred Units	Sep. 29, 2012 Convertible Preferred Units	Dec. 31, 2011 Convertible Preferred Units On or after December 22, 2015
Stockholders Equity Note [Line Items]
Forward share purchase contract	$ 350,000,000
Forward share purchase contract, shares purchased	5,581,400
Forward share repurchase contract, expiration date	Aug. 31, 2013
Long-term debt, including current maturities		2,937,500,000	3,452,200,000				632,500,000	632,500,000
Convertible preferred units issued												6,325,000
Convertible preferred units issued, per share												$ 100
Stated interest rate												4.75%
Convertible preferred stock, conversion rate												1.3333	1.3446
Conversion price (in dollars per share)												$ 75.00	$ 74.37
Debt Instrument, Number of Shares of Convertible Preferred Stock to be Delivered, As a Percentage of Purchase Contracts		85.00%
Common stock to be issued up on conversion												8,430,000
Convertible preferred stock, redemption price as a percent of liquidation preference														100.00%
Convertible preferred stock, liquidation preference per share														$ 100
Over the counter capped call purchased, maturity period				5 years
Number of common shares purchased under call option					8,430,000	8,433,123
Call option, aggregate premium					50,300,000	50,300,000
Call option, average price (in dollars per share)		$ 73.24			$ 5.97
Open option contracts written at fair value						$ 69,400,000
Strike price (in dollars per share)									$ 97.95	$ 97.12	$ 75.00
Debt Instrument Convertible Conversion Warrant Strike Price, Percentage Higher than Previous Price on November 1, 2010		60.00%