Business Combinations and Identified Intangible Assets and Goodwill, Net (Details) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, carrying amount	$ 22,306	$ 22,330
Accumulated amortization	18,022	16,926
Identified intangibles, net	4,284	5,404
Goodwill	21,714	21,677
Identified intangible assets and goodwill, net	25,998	27,081
Customer lists/relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, carrying amount	12,550	12,627
Accumulated amortization	9,916	9,570
Employment-related [Member]
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, carrying amount	5,374	5,345
Accumulated amortization	4,957	4,573
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, carrying amount	4,382	4,358
Accumulated amortization	$ 3,149	$ 2,783