Segment Reporting (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting (Textual) [Abstract]
Depreciation expense	$ 957,141	$ 939,677	$ 872,262
Acquisitions	1,858	5,113	361,921
Supply Chain Solutions [Member]
Segment Reporting (Textual) [Abstract]
Depreciation expense	29,560	28,275	29,118
Central support service assets depreciation expense allocated to other business segments [Member]
Segment Reporting (Textual) [Abstract]
Depreciation expense	$ 14,000	$ 12,000	$ 9,000
Automotive industry [Member] | Supply Chain Solutions [Member]
Segment Reporting (Textual) [Abstract]
Percentage of total revenue	29.00%	30.00%	27.00%