Summary of Information Regarding Stock Options (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 28, 2013
Number of Options
Beginning Balance, number of options	1,781,182
Granted, number of options	152,500
Exercised, number of options	(416,466)
Forfeited, number of options	(47,300)
Ending Balance, number of options	1,469,916
Options exercisable at the ending, Number of Options	695,416
Weighted Average Exercise Price per Share
Beginning Balance, Weighted Average Exercise Price per Share	$ 42.56
Granted, Weighted Average Exercise Price per Share	$ 56.40
Exercised, Weighted Average Exercise Price per Share	$ 40.52
Forfeited, Weighted Average Exercise Price per Share	$ 41.88
Ending Balance, Weighted Average Exercise Price per Share	$ 44.60
Options exercisable at September 28, 2013	$ 42.27
Weighted Average Remaining Contractual Term (years)
Options outstanding at September 28, 2013	6 years
Options exercisable at September 28, 2013	4 years 3 months 18 days
Aggregate Intrinsic Value
Options outstanding at September 28, 2013	$ 16,026
Options exercisable at September 28, 2013	$ 9,197