Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues and adjusted segment income by reportable segment
Total revenues	$ 3,401,409	$ 2,898,441	$ 10,006,631	$ 8,466,560
Segment Income	56,844	70,186	210,820	182,223
Retail
Revenues and adjusted segment income by reportable segment
Total revenues	3,401,409	2,898,441	10,006,631	8,466,560
Segment Income	48,932	61,711	191,873	166,356
PAG Investments
Revenues and adjusted segment income by reportable segment
Segment Income	$ 7,912	$ 8,475	$ 18,947	$ 15,867