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Income Taxes - Schedule of Effective Income Tax Rate Computed Using Income before Income Taxes and Applying U.S. Federal Income Tax Rate (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Tax at U.S. federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit(1) 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes [1] 2.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes [1] 3.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes [1]
Non-deductible expenses 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Valuation allowance(1) 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance [1] (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance [1] (4.70%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance [1]
Effect of Non-US operations (5.30%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings (3.30%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Effect of changes in tax law, rates 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Effect of income from non-controlling interests (9.60%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense (11.40%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense (12.20%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense
Total effective income tax rate 22.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 22.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 17.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
[1] State income taxes includes changes related to state valuation allowances. Valuation allowance includes changes in federal valuation allowances.