SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets, Net (Details)	12 Months Ended
	Dec. 31, 2014
Customer Lists | Minimum
Goodwill and Other Intangible Assets, Net
Estimated useful life	10 years
Customer Lists | Maximum
Goodwill and Other Intangible Assets, Net
Estimated useful life	14 years
Trade Names | Intangible assets with definite lives | Minimum
Goodwill and Other Intangible Assets, Net
Estimated useful life	1 year
Trade Names | Intangible assets with definite lives | Maximum
Goodwill and Other Intangible Assets, Net
Estimated useful life	10 years
Non-compete agreements | Minimum
Goodwill and Other Intangible Assets, Net
Estimated useful life	2 years
Non-compete agreements | Maximum
Goodwill and Other Intangible Assets, Net
Estimated useful life	5 years
Other definite-lived intangible assets | Maximum
Goodwill and Other Intangible Assets, Net
Estimated useful life	17 years