Other Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 494,019,000		$ 494,019,000		$ 359,197,000
Less accumulated amortization	(210,376,000)		(210,376,000)		(183,389,000)
Total	283,643,000		283,643,000		175,808,000
Amortization expense for finite-lived intangible assets	10,200,000	9,100,000	27,800,000	26,300,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	390,897,000		390,897,000		318,939,000
Less accumulated amortization	(186,666,000)		(186,666,000)		(165,578,000)
Total	204,231,000		204,231,000		153,361,000
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	9,339,000		9,339,000		9,150,000
Less accumulated amortization	(7,191,000)		(7,191,000)		(6,659,000)
Total	2,148,000		2,148,000		2,491,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	93,783,000		93,783,000		31,108,000
Less accumulated amortization	(16,519,000)		(16,519,000)		(11,152,000)
Total	$ 77,264,000		$ 77,264,000		$ 19,956,000