Segment Information (Details 3) (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
Sales to external customers and Long-lived assets, net
Sales to external customer	$ 3,371,252	$ 3,329,854	$ 3,306,021	$ 3,156,390	$ 2,858,467	$ 2,832,517	$ 2,767,068	$ 2,669,440	$ 13,163,517	$ 11,127,492	$ 9,943,350
Long-lived assets, net	1,347,895				1,151,751				1,347,895	1,151,751
U.S.
Sales to external customers and Long-lived assets, net
Sales to external customer									8,403,151	7,143,481	6,313,835
Long-lived assets, net	961,780				831,666				961,780	831,666
Foreign
Sales to external customers and Long-lived assets, net
Sales to external customer									4,760,366	3,984,011	3,629,515
Long-lived assets, net	$ 386,115				$ 320,085				$ 386,115	$ 320,085