Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2014
Options Outstanding
Outstanding, beginning balance	814,291
Granted	213,229
Forfeited	(4,001)
Exercised	(43,826)
Outstanding, ending balance	979,693
Options exercisable at end of period	539,644
Weighted-Average Exercise Price
Outstanding, beginning balance	$ 39.56
Granted	$ 57.54
Forfeited	$ 46.57
Exercised	$ 36.95
Outstanding, ending balance	$ 43.52
Options exercisable at end of period	$ 36.49
Weighted-Average Remaining Contractual Term
Outstanding at end of period	4 years 9 months 18 days
Options exercisable at end of period	3 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 9,917
Options exercisable at end of period	$ 8,631