Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Defined Benefit Plan Disclosure [Line Items]
Multiemployer pension withdrawal expense	$ 0	$ 39	$ 0	$ 39
U.S. Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	16	19	48	57
Interest cost	130	128	390	384
Expected return on assets	(156)	(144)	(468)	(432)
Recognized actuarial net loss	73	62	217	186
Total defined benefit net periodic pension cost	63	65	187	195
Multiemployer benefit expense	313	308	860	884
Multiemployer pension withdrawal expense	0	39	0	39
Net periodic pension cost	376	412	1,047	1,118
UK Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	527	590	1,582	1,770
Expected return on assets	(411)	(418)	(1,233)	(1,254)
Recognized actuarial net loss	8	24	29	70
Total defined benefit net periodic pension cost	124	196	378	586
Multiemployer benefit expense	0	0	0	0
Multiemployer pension withdrawal expense	0	0	0	0
Net periodic pension cost	$ 124	$ 196	$ 378	$ 586