Goodwill and Identifiable Intangible Assets, Net (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Identifiable Intangible Assets, Net
Gross Book Value	85,102	$ 82,925
Accumulated Amortization	(39,090)	(37,259)
Customer relationships
Identifiable Intangible Assets, Net
Gross Book Value	52,617	50,440
Accumulated Amortization	(27,653)	(26,287)
Customer relationships \| Minimum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	2 years
Customer relationships \| Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	15 years
Backlog
Identifiable Intangible Assets, Net
Gross Book Value	1,600	1,600
Accumulated Amortization	(975)	(829)
Backlog \| Minimum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	1 year
Backlog \| Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	2 years
Noncompete agreements
Identifiable Intangible Assets, Net
Gross Book Value	2,890	2,890
Accumulated Amortization	(2,878)	(2,868)
Noncompete agreements \| Minimum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	2 years
Noncompete agreements \| Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	7 years
Tradenames
Identifiable Intangible Assets, Net
Gross Book Value	27,995	27,995
Accumulated Amortization	(7,584)	$ (7,275)
Tradenames \| Minimum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	2 years
Tradenames \| Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years	25 years

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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