Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Disclosure Income Taxes Summary Of Deferred Tax Assets And Liabilities [Abstract]
Accounts receivable, principally due to the allowance for doubtful accounts	$ 7,434	$ 4,451
Accrued expenses not currently deductible for tax	5,610
Stock based compensation	16,405	12,022
Income tax credit	3,830	1,349
Net operating loss carry forwards	127,487	4,438
Fixed assets	3,483	4,135
Basis Difference In Equity Investment	3,262us-gaap_DeferredTaxAssetsInvestments
Accrued Escheat	12,058flt_DeferredTaxAssetsAccruedEscheat
Other	9,385us-gaap_DeferredTaxAssetsOther	541us-gaap_DeferredTaxAssetsOther
Deferred tax assets before valuation allowance	188,954us-gaap_DeferredTaxAssetsGross	26,936us-gaap_DeferredTaxAssetsGross
Valuation allowance	(27,082)	(1,450)
Deferred tax assets, net	161,872us-gaap_DeferredTaxAssetsNet	25,486us-gaap_DeferredTaxAssetsNet
Property and equipment, principally due to differences between book and tax depreciation	(868)	(4,180)
Intangibles-including goodwill	(833,910)	(226,396)
Basis difference in investment in foreign subsidiaries	(23,128)	(25,145)
Other	(17,684)us-gaap_DeferredTaxLiabilitiesOther	(14,519)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities	(875,590)us-gaap_DeferredIncomeTaxLiabilities	(270,240)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities	$ (713,718)us-gaap_DeferredTaxLiabilities	$ (244,754)us-gaap_DeferredTaxLiabilities

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments).

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences from intangible assets including goodwill.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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Amount of deferred tax asset, before valuation allowance, attributable to deductible other tax carryforwards.

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