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Income taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes Disclosure [Line Items]        
Income tax expense at federal statutory rate, rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Excess tax benefits $ 56,800,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation $ 32,500,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation $ 29,400,000us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation  
Cumulative undistributed earnings of non-U.S. subsidiaries 865,800,000us-gaap_UndistributedEarningsOfForeignSubsidiaries 568,800,000us-gaap_UndistributedEarningsOfForeignSubsidiaries 388,300,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Valuation allowance for deferred tax assets 27,100,000us-gaap_OperatingLossCarryforwardsValuationAllowance 1,500,000us-gaap_OperatingLossCarryforwardsValuationAllowance    
Net change in the total valuation allowance 25,600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 100,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Net operating loss carryforwards for state income tax purposes 869,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal      
Net operating loss carryforwards for foreign income tax purposes 4,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign      
Federal operating loss carry forwards 237,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic      
Accrued interest and penalties related to the unrecognized tax benefits 7,400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 8,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 1,500,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Total unrecognized tax benefits 18,641,000us-gaap_UnrecognizedTaxBenefits 21,601,000us-gaap_UnrecognizedTaxBenefits 7,077,000us-gaap_UnrecognizedTaxBenefits 4,994,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would affect effective tax rate $ 7,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
State Jurisdiction [Member]        
Income Taxes Disclosure [Line Items]        
End year net operating loss carryforwards offset future taxable income 2026      
Federal Taxable Income [Member]        
Income Taxes Disclosure [Line Items]        
End year net operating loss carryforwards offset future taxable income 2033