Goodwill and Intangible Assets, Estimated Useful Lives of Identifiable Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2014
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	3 years
Minimum [Member] | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	3 years
Minimum [Member] | Internally Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year
Minimum [Member] | Customer Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	8 months
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years
Maximum [Member] | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Maximum [Member] | Internally Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	7 years
Maximum [Member] | Customer Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	11 months