Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013
Options Outstanding
Outstanding, beginning balance	831,504
Granted	238,767
Forfeited	(35,136)
Exercised	(115,158)
Outstanding, ending balance	919,977
Options exercisable at end of period	455,199
Weighted-Average Exercise Price
Outstanding, beginning balance	$ 36.31
Granted	$ 43.78
Forfeited	$ 44.93
Exercised	$ 26.58
Outstanding, ending balance	$ 39.23
Options exercisable at end of period	$ 31.50
Weighted-Average Remaining Contractual Term
Outstanding at end of period	5 years 1 month 6 days
Options exercisable at end of period	4 years
Aggregate Intrinsic Value
Outstanding at end of period	$ 7,194
Options exercisable at end of period	$ 6,438