CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 22,887	$ 20,342	$ 61,301	$ 55,662
Other comprehensive loss
Currency translation adjustments				(2,810)
Comprehensive income	$ 22,887	$ 20,342	$ 61,301	$ 52,852