Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	6 Months Ended		6 Months Ended			6 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 North American Business	Dec. 31, 2011 North American Business	Oct. 01, 2011 North American Business Minimum	Jun. 30, 2012 International Business	Dec. 31, 2011 International Business	Jun. 30, 2012 Europe item	Dec. 31, 2011 Western Europe	Jun. 30, 2012 Western Europe	Jun. 30, 2012 Central Europe	Dec. 31, 2011 Central Europe	Aug. 31, 2011 Central Europe	Jun. 30, 2012 Latin America	Dec. 31, 2011 Latin America	Oct. 01, 2011 Latin America Minimum	Jun. 30, 2012 Australia	Dec. 31, 2011 Australia	Oct. 01, 2011 Australia Minimum	Jun. 30, 2012 UKI	Dec. 31, 2011 UKI	Aug. 31, 2011 UKI
Goodwill
Reporting unit, percentage that fair value exceeded carrying value					40.00%								4.90%			40.00%			40.00%			15.10%
Goodwill impairment charge									$ 46,500
Number of reporting units								3
Gross amount of goodwill
Balance, beginning of period	2,574,285		2,010,241			564,044
Deductible goodwill acquired during the year	69,128		5,118			64,010
Currency effects	(1,597)		1,166			(2,763)
Balance, end of period	2,641,816		2,016,525			625,291
Accumulated amortization
Balance, beginning of period	320,017		261,362			58,655
Currency effects	(11)		59			(70)
Balance, end of period	320,006		261,421			58,585
Net balance	2,321,810	2,254,268	1,755,104	1,748,879		566,706	505,389		46,439	44,157	81,448	63,781		71,066	27,322		61,887	61,697		308,148	306,150
Accumulated Goodwill Impairment Balance	$ 132,409	$ 132,409	$ 85,909	$ 85,909		$ 46,500	$ 46,500