Other Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 494,319,000		$ 355,897,000
Less accumulated amortization	(188,384,000)		(180,089,000)
Total	305,935,000		175,808,000
Amortization expense for finite-lived intangible assets	7,600,000	8,500,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	390,566,000		315,639,000
Less accumulated amortization	(169,292,000)		(162,278,000)
Total	221,274,000		153,361,000
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	9,142,000		9,150,000
Less accumulated amortization	(6,869,000)		(6,659,000)
Total	2,273,000		2,491,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	94,611,000		31,108,000
Less accumulated amortization	(12,223,000)		(11,152,000)
Total	$ 82,388,000		$ 19,956,000