Other Intangible Assets, Net Schedule of Finite-Lived Intangible Assets by Major Class (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Other identifiable intangible assets, gross	$ 368,757,000		$ 368,757,000		$ 286,465,000
Less accumulated amortization	(167,243,000)		(167,243,000)		(153,776,000)
Other identifiable intangible assets, net	201,514,000		201,514,000		132,689,000
Amortization expense for finite-lived intangible assets	23,100,000	22,700,000	42,500,000	43,200,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Other identifiable intangible assets, gross	308,540,000		308,540,000		241,220,000
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Other identifiable intangible assets, gross	15,057,000		15,057,000		15,332,000
Trade Names and Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Other identifiable intangible assets, gross	44,913,000		44,913,000		29,913,000
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Other identifiable intangible assets, gross	$ 247,000		$ 247,000		$ 0