Summary of Information Regarding Stock Options (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013
Number of Options
Beginning Balance, number of options	1,781,182
Granted, number of options	152,500
Exercised, number of options	(357,720)
Forfeited, number of options	(32,600)
Ending Balance, number of options	1,543,362
Options exercisable at the ending, Number of Options	757,462
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	$ 40.89
Forfeited, Weighted Average Exercise Price per Share	$ 38.66
Ending Balance, Weighted Average Exercise Price per Share	$ 44.40
Options exercisable at March 30, 2013	$ 41.96
Weighted Average Remaining Contractual Term (years)
Options outstanding at March 30, 2013	6 years 6 months
Options exercisable at March 30, 2013	4 years 9 months 18 days
Aggregate Intrinsic Value
Options outstanding at March 30, 2013	$ 19,585
Options exercisable at March 30, 2013	$ 11,460