Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Amortizable intangible assets:
Finite-lived intangible assets, gross carrying amount	$ 352,218	$ 328,010
Finite-lived intangible assets, accumulated amortization	(75,168)	(69,631)
Finite-lived intangible assets, net carrying amount	277,050	258,379
Nonamortized intangible assets:
Indefinite-lived intangible assets, gross carrying amount	226,547	191,202
Indefinite-lived intangible assets, accumulated amortization
Indefinite-lived intangible assets	226,547	191,202
Intangible assets, exclusive of goodwill, Gross	578,765	519,212
Intangible assets, exclusive of goodwill, Accumulated amortization	(75,168)	(69,631)
Intangible assets, net, exclusive of goodwill	503,597	449,581
Long-term franchise agreements and contracts [Member]
Amortizable intangible assets:
Finite-lived intangible assets, gross carrying amount	195,729	190,532
Finite-lived intangible assets, accumulated amortization	(33,375)	(31,592)
Finite-lived intangible assets, net carrying amount	162,354	158,940
Customer lists [Member]
Amortizable intangible assets:
Finite-lived intangible assets, gross carrying amount	115,512	96,501
Finite-lived intangible assets, accumulated amortization	(31,820)	(28,475)
Finite-lived intangible assets, net carrying amount	83,692	68,026
Non-competition Agreements [Member]
Amortizable intangible assets:
Finite-lived intangible assets, gross carrying amount	9,374	9,374
Finite-lived intangible assets, accumulated amortization	(6,498)	(6,389)
Finite-lived intangible assets, net carrying amount	2,876	2,985
Other [Member]
Amortizable intangible assets:
Finite-lived intangible assets, gross carrying amount	31,603	31,603
Finite-lived intangible assets, accumulated amortization	(3,475)	(3,175)
Finite-lived intangible assets, net carrying amount	$ 28,128	$ 28,428