Goodwill and Identifiable Intangible Assets, Net (Details 2) (USD $) In Thousands, unless otherwise specified					6 Months Ended				6 Months Ended				6 Months Ended				6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Customer relationships	Dec. 31, 2013 Customer relationships	Jun. 30, 2014 Customer relationships Minimum	Jun. 30, 2014 Customer relationships Maximum	Jun. 30, 2014 Backlog	Dec. 31, 2013 Backlog	Jun. 30, 2014 Backlog Minimum	Jun. 30, 2014 Backlog Maximum	Jun. 30, 2014 Noncompete agreements	Dec. 31, 2013 Noncompete agreements	Jun. 30, 2014 Noncompete agreements Minimum	Jun. 30, 2014 Noncompete agreements Maximum	Jun. 30, 2014 Tradenames	Dec. 31, 2013 Tradenames	Jun. 30, 2014 Tradenames Minimum	Jun. 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	$ 48,725	$ 40,404			$ 1,600	$ 6,515			$ 2,890	$ 2,890			$ 28,095	$ 23,695
Accumulated Amortization	$ (32,991)	$ (36,121)	$ (23,520)	$ (20,978)			$ (117)	$ (6,515)			$ (2,758)	$ (2,649)			$ (6,596)	$ (5,979)