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Nature of Business, Acquisitions, Significant Accounting Policies and Recent Accounting Pronouncements (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income attributable to World Fuel	$ 67,134us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 55,660us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 48,226us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 50,727us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 51,862us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 51,472us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 51,016us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 48,725us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 221,747us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 203,075us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 189,345us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:
Weighted average common shares for basic earnings per common share									70,750us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	71,224us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	71,154us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities (in shares)									573us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	576us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	663us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares for diluted earnings per common share									71,323us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	71,800us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	71,817us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Weighted average securities which are not included in the calculation of diluted earnings per common share (in shares)									881us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	594us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	603us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Basic earnings per common share (in dollars per share)	$ 0.95us-gaap_EarningsPerShareBasic	$ 0.79us-gaap_EarningsPerShareBasic	$ 0.68us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.71us-gaap_EarningsPerShareBasic	$ 0.68us-gaap_EarningsPerShareBasic	$ 3.13us-gaap_EarningsPerShareBasic	$ 2.85us-gaap_EarningsPerShareBasic	$ 2.66us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share)	$ 0.94us-gaap_EarningsPerShareDiluted	$ 0.78us-gaap_EarningsPerShareDiluted	$ 0.68us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.73us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.68us-gaap_EarningsPerShareDiluted	$ 3.11us-gaap_EarningsPerShareDiluted	$ 2.83us-gaap_EarningsPerShareDiluted	$ 2.64us-gaap_EarningsPerShareDiluted

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