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Significant Accounting Policies (Details) (USD $)	6 Months Ended			9 Months Ended			9 Months Ended		9 Months Ended
	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 2013 Acquisitions Land segment item	Sep. 30, 2013 2012 Acquisitions Land segment Adjustment	Sep. 30, 2013 2012 Acquisitions Land segment Reclassification	Sep. 30, 2013 2012 Acquisitions Aviation segment Adjustment	Sep. 30, 2013 2012 Acquisitions Aviation segment Reclassification	Sep. 30, 2013 2012 Acquisitions Marine segment Adjustment
Significant Accounting Policies
Incorrect cash flow presentation related to an acquisition payment	$ 17,700,000
Goodwill
Goodwill		477,258,000	470,506,000	9,600,000	(2,000,000)	(6,500,000)		6,500,000
Number of businesses acquired				2
Reclassification to identifiable intangible assets					3,300,000
Increase (decrease) in acquired net assets					(900,000)
Increase in assumed liabilities					400,000
Reductions in goodwill due to foreign currency translation adjustments							$ (300,000)		$ (500,000)

X

- Definition

The amount of net tangible asset recognized, as of the acquisition date.

+ References

No definition available.

+ Details

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X

- Definition

Cash outflow amount presented incorrectly in the statement of cash flows.

+ References

No definition available.

+ Details

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

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- Definition

Amount of liabilities assumed at the acquisition date.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Topic 350

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

The number of businesses acquired by the entity during the period.

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