Segment Reporting (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Depreciation expense	$ 1,040,259us-gaap_Depreciation	$ 957,141us-gaap_Depreciation	$ 939,677us-gaap_Depreciation
Acquisition payments	9,972	1,858	5,113
Central support service assets depreciation expense allocated to other business segments [Member]
Segment Reporting Information [Line Items]
Depreciation expense	$ 21,000	$ 14,000	$ 12,000
Automotive industry [Member] \| Supply Chain Solutions [Member]
Segment Reporting Information [Line Items]
Percentage of total revenue	27.00%	29.00%	30.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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