CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 19,342	$ 19,742	$ 38,414	$ 35,320
Other comprehensive loss
Currency translation adjustments		(3,086)		(2,810)
Comprehensive income	$ 19,342	$ 16,656	$ 38,414	$ 32,510