Identified Intangible Assets and Goodwill, Net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, carrying amount	$ 24,336	$ 22,330
Accumulated amortization	18,668	16,926
Identified intangibles, net	5,668	5,404
Goodwill	23,515	21,677
Intangible assets and goodwill net	29,183	27,081
Customer lists/relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, carrying amount	14,378	12,627
Accumulated amortization	10,319	9,570
Employment-related
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period (years)	3 years 10 months 24 days
Amortized intangible assets, carrying amount	5,430	5,345
Accumulated amortization	5,082	4,573
Tradenames
Acquired Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, carrying amount	4,528	4,358
Accumulated amortization	$ 3,267	$ 2,783