Change in Accounting Principle - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Change In Accounting Principle
Net income before accounting changes	$ 73,200,000		$ 213,400,000
Net income	$ 88,641,000	$ 56,706,000	$ 233,592,000	$ 240,802,000
Earnings per share diluted before accounting charges	$ 0.32		$ 0.93
Diluted	$ 0.39	$ 0.26	$ 1.02	$ 1.06