Goodwill and Intangible Assets, Estimated Useful Lives of Identifiable Intangible Assets (Details)	3 Months Ended
	Mar. 31, 2015
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	3 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years
Non-Compete Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	3 years
Non-Compete Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Internally Developed Software [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year
Internally Developed Software [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	7 years
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year
Customer Backlog [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	9 months
Customer Backlog [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	11 months