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Employee Incentive and Retirement Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option granted to purchase of common stock (shares) 768,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
Options granted, weighted average exercise price ($ per share) $ 20.81us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Options exercised (shares) 531,822us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 1,439,124us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Total intrinsic values of options exercised $ 10.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 6.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Total fair value of shares vested 6.1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 3.9us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Expense related to accelerated vesting of stock options   3.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
Internally Developed Software    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense, capitalized amount 0.8us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
0.3us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Option granted to purchase of common stock (shares)   14,218,940us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Options granted, weighted average exercise price ($ per share)   $ 4.99us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Common stock, weighted average grant date fair value per share ($ per share) $ 10.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
$ 4.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Options granted, total estimated fair value 7.9ck0001409970_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
59.7ck0001409970_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Unrecognized compensation cost 115.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
 
Unrecognized compensation cost expected period for recognition 3 years 22 days  
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost expected period for recognition 3 years 10 months 28 days  
RSUs granted 975,763us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Aggregate fair value 20.0ck0001409970_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsAggregateIntrinsicValueNonvested1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Unrecognized compensation cost $ 19.5us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Available for ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total common stock authorized and reserved for future issuance (shares) 3,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= ck0001409970_EmployeeStockPurchasePlansMember
 
Requisite service period 6 months