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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income attributable to World Fuel			$ 48,200	$ 38,200	$ 122,400	$ 98,100
Diluted earnings per common share (in dollars per share)			$ 0.73	$ 0.56	$ 1.84	$ 1.45
Income from operations			$ 93,600	$ 78,200	$ 239,200	$ 196,400
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use assets							$ 167,300
Lease liabilities							$ 173,600
Recognized from Prior Period
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income from operations		$ 3,400
Income from operations, net of tax		2,300
Pro forma
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income attributable to World Fuel					$ 113,500
Diluted earnings per common share (in dollars per share)					$ 1.70
Discrete tax benefit, prior year foreign tax return	$ 3,480	$ 3,170			$ 6,600

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