Identified Intangible Assets and Goodwill, Net (Details) - USD ($) $ in Thousands	Jul. 04, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Identified intangible assets, gross	$ 29,339	$ 28,388
Accumulated amortization	23,498	22,489
Identified intangible assets, net	5,841	5,899
Goodwill	29,041	28,164
Identified intangible assets and goodwill, net	34,882	34,063
Customer lists/relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Identified intangible assets, gross	16,803	16,076
Accumulated amortization	13,172	12,560
Employment-related [Member]
Finite-Lived Intangible Assets [Line Items]
Identified intangible assets, gross	7,168	7,026
Accumulated amortization	5,985	5,776
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Identified intangible assets, gross	5,368	5,286
Accumulated amortization	$ 4,341	$ 4,153