Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information
Total Revenues	$ 758,467	$ 748,125	$ 752,165	$ 746,498	$ 741,837	$ 768,306	$ 758,551	$ 746,009	$ 3,005,255	$ 3,014,703	$ 2,892,349
Depreciation and Amortization									316,344	319,499	304,205
Depreciation									280,598	290,638	278,760
Amortization									35,746	28,861	25,445
Adjusted OIBDA									912,217	950,439	926,676
Total Assets	6,358,339				6,041,258				6,358,339	6,041,258	6,416,393
Expenditures for Segment Assets									394,689	306,104	285,892
Capital Expenditures									240,683	209,155	258,849
Cash Paid for Acquisitions, Net of Cash Acquired									125,134	75,246	13,841
Additions to Customer Relationship and Acquisition Costs									28,872	21,703	13,202
North American Business
Segment Reporting Information
Total Revenues									2,198,563	2,229,143	2,193,464
Depreciation and Amortization									181,607	180,763	185,483
Depreciation									168,896	168,549	172,713
Amortization									12,711	12,214	12,770
Adjusted OIBDA									916,196	961,973	969,505
Total Assets	4,304,340				4,194,850				4,304,340	4,194,850	4,370,465
Expenditures for Segment Assets									177,687	139,079	135,825
Capital Expenditures									123,882	117,338	120,162
Cash Paid for Acquisitions, Net of Cash Acquired									28,126	5,436	5,675
Additions to Customer Relationship and Acquisition Costs									25,679	16,305	9,988
International Business
Segment Reporting Information
Total Revenues									806,692	785,560	698,885
Depreciation and Amortization									103,393	104,815	81,932
Depreciation									80,493	88,432	69,480
Amortization									22,900	16,383	12,452
Adjusted OIBDA									173,620	164,212	130,969
Total Assets	1,854,050				1,646,701				1,854,050	1,646,701	1,641,251
Expenditures for Segment Assets									191,360	152,064	115,496
Capital Expenditures									91,159	76,856	104,116
Cash Paid for Acquisitions, Net of Cash Acquired									97,008	69,810	8,166
Additions to Customer Relationship and Acquisition Costs									3,193	5,398	3,214
Corporate
Segment Reporting Information
Depreciation and Amortization									31,344	33,921	36,790
Depreciation									31,209	33,657	36,567
Amortization									135	264	223
Adjusted OIBDA									(177,599)	(175,746)	(173,798)
Total Assets	199,949				199,707				199,949	199,707	404,677
Expenditures for Segment Assets									25,642	14,961	34,571
Capital Expenditures									$ 25,642	$ 14,961	$ 34,571