Income Taxes - Effective Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
United States	$ 317,400	$ 326,990	$ 441,526
International	365,933	255,229	268,833
Income before income taxes	683,333	582,219	710,359
Provision at statutory tax rate	239,166	203,777	248,626
State taxes, net of federal benefit	11,734	11,885	16,019
International effective tax rate differential	(56,865)	(22,059)	(43,008)
Change in valuation allowance	(7,803)	(8,253)	(6,266)
Other non-deductible expenses	4,040	2,840	2,764
Changes in tax accruals	1,335	(1,336)	(10,613)
Other	(6,664)	(4,511)	(3,880)
Provision for income taxes	$ 184,943us-gaap_IncomeTaxExpenseBenefit	$ 182,343us-gaap_IncomeTaxExpenseBenefit	$ 203,642us-gaap_IncomeTaxExpenseBenefit

Income Before Income Taxes and Adjustment For Noncontrolling Interest.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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