Revisions to Financial Statements (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Cumulative Impact to Income Statements Relating to Accounting Adjustments	$ 1,000,000
Goodwill	4,247,286,000	4,182,928,000	4,100,362,000
Total noncurrent assets	4,895,739,000	4,853,724,000
Total assets	7,193,110,000	7,311,520,000
Other current liabilities	170,733,000	234,764,000
Total current liabilities	540,067,000	553,475,000
Deferred income tax liabilities - non current	838,857,000	771,869,000
Other noncurrent liabilities	50,476,000	60,657,000
Total noncurrent liabilities	2,857,607,000	2,939,284,000
Total liabilities	3,397,674,000	3,492,759,000
Retained earnings	1,651,829,000	1,582,489,000
Total stockholders' equity	3,795,436,000	3,818,761,000	3,878,810,000	3,657,686,000
Total liabilities and stockholders' equity	7,193,110,000	7,311,520,000
Scenario, Previously Reported [Member]
Goodwill		4,234,821,000	4,152,255,000
Total noncurrent assets		4,905,617,000
Total assets		7,363,413,000
Other current liabilities		275,543,000
Total current liabilities		594,254,000
Deferred income tax liabilities - non current		737,383,000
Other noncurrent liabilities		109,074,000
Total noncurrent liabilities		2,953,215,000
Total liabilities		3,547,469,000
Retained earnings		1,579,672,000
Total stockholders' equity		3,815,944,000		3,654,869,000
Total liabilities and stockholders' equity		7,363,413,000
Restatement Adjustment [Member]
Goodwill		(51,893,000)	(51,893,000)
Total noncurrent assets		(51,893,000)
Total assets		(51,893,000)
Other current liabilities		(40,779,000)
Total current liabilities		(40,779,000)
Deferred income tax liabilities - non current		34,486,000
Other noncurrent liabilities		(48,417,000)
Total noncurrent liabilities		(13,931,000)
Total liabilities		(54,710,000)
Retained earnings		2,817,000
Total stockholders' equity		2,817,000		2,817,000
Total liabilities and stockholders' equity		$ (51,893,000)