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Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Deferred Tax Assets, Operating Loss Carryforwards, Domestic $ 5,441us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic $ 6,063us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic  
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount 175,445us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 140,656us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 114,496us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount (5,390)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (2,055)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount 1us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 7,395us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation    
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions   (2,082)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 1,577us-gaap_IncomeTaxReconciliationOtherAdjustments 826us-gaap_IncomeTaxReconciliationOtherAdjustments 967us-gaap_IncomeTaxReconciliationOtherAdjustments
Income Tax Expense (Benefit) 179,028us-gaap_IncomeTaxExpenseBenefit 137,346us-gaap_IncomeTaxExpenseBenefit 115,464us-gaap_IncomeTaxExpenseBenefit
Deferred Tax Assets, Tax Credit Carryforwards, Research 2,147us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 2,259us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch  
Deferred Tax Liabilities, Intangible Assets 14,125us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 3,559us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 241us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 215us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves 662us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 255us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses 5,407us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 330us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses  
Deferred Tax Assets, Unrealized Currency Losses 0us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses 2,632us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses  
Deferred Tax Assets, Other 8,500us-gaap_DeferredTaxAssetsOther 47us-gaap_DeferredTaxAssetsOther  
Deferred Tax Assets, Gross 36,523us-gaap_DeferredTaxAssetsGross 15,360us-gaap_DeferredTaxAssetsGross  
Deferred Tax Assets, Valuation Allowance 0us-gaap_DeferredTaxAssetsValuationAllowance (5,390)us-gaap_DeferredTaxAssetsValuationAllowance  
Deferred Tax Assets, Net of Valuation Allowance 36,523us-gaap_DeferredTaxAssetsNet 9,970us-gaap_DeferredTaxAssetsNet  
Deferred Tax Liabilities, Tax Deferred Income 762us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome 953us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome  
Deferred Tax Liabilities, Financing Arrangements 0us-gaap_DeferredTaxLiabilitiesFinancingArrangements (1,779)us-gaap_DeferredTaxLiabilitiesFinancingArrangements  
Deferred Tax Liabilities, Unrealized Currency Transaction Gains (1,588)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains 0us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains  
Deferred Tax Liabilities, Other 0us-gaap_DeferredTaxLiabilitiesOther (161)us-gaap_DeferredTaxLiabilitiesOther  
Deferred Tax Liabilities, Gross (2,350)us-gaap_DeferredIncomeTaxLiabilities (2,893)us-gaap_DeferredIncomeTaxLiabilities  
Deferred Tax Assets, Net $ 34,173us-gaap_DeferredTaxAssetsLiabilitiesNet $ 7,077us-gaap_DeferredTaxAssetsLiabilitiesNet