Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Reconciliation of effective income taxes rate
Increase in effective tax rate due to reserve on an uncertain tax position (as a percent)	45.70%		25.00%
Decrease in effective tax rate due to treatment of foreign tax benefits (as a percent)	145.50%		79.50%
Increase (decrease) in effective tax rate due to tax adjustments		(2.60%)		2.70%
Accrued for interest and penalties related to uncertain income tax	$ 820	$ 0	$ 820	$ 0