Other Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 492,922,000		$ 496,899,000
Less accumulated amortization	(226,791,000)		(218,629,000)
Total	266,131,000		278,270,000
Amortization expense for finite-lived intangible assets	9,800,000	7,600,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	390,839,000		394,070,000
Less accumulated amortization	(198,521,000)		(192,612,000)
Total	192,318,000		201,458,000
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	9,316,000		9,332,000
Less accumulated amortization	(7,504,000)		(7,351,000)
Total	1,812,000		1,981,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	92,767,000		93,497,000
Less accumulated amortization	(20,766,000)		(18,666,000)
Total	$ 72,001,000		$ 74,831,000