Other Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 495,903,000		$ 495,903,000		$ 355,897,000
Less accumulated amortization	(198,864,000)		(198,864,000)		(180,089,000)
Total	297,039,000		297,039,000		175,808,000
Amortization expense for finite-lived intangible assets	10,000,000	8,700,000	17,600,000	17,000,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	391,728,000		391,728,000		315,639,000
Less accumulated amortization	(177,287,000)		(177,287,000)		(162,278,000)
Total	214,441,000		214,441,000		153,361,000
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	9,349,000		9,349,000		9,150,000
Less accumulated amortization	(7,031,000)		(7,031,000)		(6,659,000)
Total	2,318,000		2,318,000		2,491,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	94,826,000		94,826,000		31,108,000
Less accumulated amortization	(14,546,000)		(14,546,000)		(11,152,000)
Total	$ 80,280,000		$ 80,280,000		$ 19,956,000