Goodwill and Identifiable Intangible Assets, Net (Details 2) (USD $) In Thousands, unless otherwise specified					9 Months Ended				9 Months Ended				9 Months Ended				9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Customer relationships	Dec. 31, 2013 Customer relationships	Sep. 30, 2014 Customer relationships Minimum	Sep. 30, 2014 Customer relationships Maximum	Sep. 30, 2014 Backlog	Dec. 31, 2013 Backlog	Sep. 30, 2014 Backlog Minimum	Sep. 30, 2014 Backlog Maximum	Sep. 30, 2014 Noncompete agreements	Dec. 31, 2013 Noncompete agreements	Sep. 30, 2014 Noncompete agreements Minimum	Sep. 30, 2014 Noncompete agreements Maximum	Sep. 30, 2014 Tradenames	Dec. 31, 2013 Tradenames	Sep. 30, 2014 Tradenames Minimum	Sep. 30, 2014 Tradenames Maximum
Identifiable Intangible Assets, Net
Estimated Useful Lives in Years					1 year	15 years			1 year	2 years			2 years	7 years			2 years	25 years
Gross Book Value	$ 81,310	$ 73,504	$ 48,825	$ 40,404			$ 1,600	$ 6,515			$ 2,890	$ 2,890			$ 27,995	$ 23,695
Accumulated Amortization	$ (35,051)	$ (36,121)	$ (24,829)	$ (20,978)			$ (473)	$ (6,515)			$ (2,813)	$ (2,649)			$ (6,936)	$ (5,979)