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Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Item	Sep. 30, 2011
Business Segments
Number of reportable operating business segments			3
Revenue:
Total revenue	$ 9,911,673	$ 9,510,792	$ 29,009,525	$ 25,298,907
Gross profit:
Gross profit	180,752	170,847	510,110	472,717
Income from operations:
Income from operations	71,048	70,925	202,662	192,553
Operating Segments
Income from operations:
Income from operations	85,289	84,780	238,010	228,381
Aviation segment
Revenue:
Total revenue	3,823,338	3,540,503	10,782,756	9,551,924
Gross profit:
Gross profit	84,197	83,966	218,282	236,121
Income from operations:
Income from operations	39,808	41,228	92,601	117,022
Marine segment
Revenue:
Total revenue	3,630,094	4,045,176	11,301,429	10,577,578
Gross profit:
Gross profit	53,960	50,069	160,785	140,958
Income from operations:
Income from operations	27,296	24,899	82,672	68,017
Land segment
Revenue:
Total revenue	2,458,241	1,925,113	6,925,340	5,169,405
Gross profit:
Gross profit	42,595	36,812	131,043	95,638
Income from operations:
Income from operations	18,185	18,653	62,737	43,342
Corporate
Income from operations:
Corporate overhead	$ 14,241	$ 13,855	$ 35,348	$ 35,828

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of general expenses not normally included in Other Operating Costs and Expenses.

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-Topic 225

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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

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

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-Name Accounting Standards Codification

-Topic 225

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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