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Fair Value of Financial Instruments Measured at Fair Value - Additional Information about Servicing Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Servicing Assets, Changes in fair value due to:      
Fair value at December 31,     $ 2,181us-gaap_ServicingAssetAtFairValueAmount
Fair value at March 31, 3,496us-gaap_ServicingAssetAtFairValueAmount   2,181us-gaap_ServicingAssetAtFairValueAmount
Servicing Liabilities, Changes in fair value due to:      
Fair value at December 31,     3,973us-gaap_ServicingLiabilityAtFairValueAmount
Fair value at March 31, 4,397us-gaap_ServicingLiabilityAtFairValueAmount   3,973us-gaap_ServicingLiabilityAtFairValueAmount
Fair Value, Measurements, Recurring      
Servicing Assets, Changes in fair value due to:      
Fair value at December 31, 2,181us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
534us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Additions, included in other/deferred revenue 1,508us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
442us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Changes in fair value, included in servicing fees (491)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
(112)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair value at March 31, 3,496us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
864us-gaap_ServicingAssetAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Servicing Liabilities, Changes in fair value due to:      
Fair value at December 31, 3,973us-gaap_ServicingLiabilityAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
936us-gaap_ServicingLiabilityAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Additions, included in other/deferred revenue 1,412us-gaap_ServicingLiabilityAtFairValueAdditions
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
512us-gaap_ServicingLiabilityAtFairValueAdditions
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Changes in fair value, included in servicing fees (988)us-gaap_ServicingLiabilityAtFairValueOtherChangesInFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
(227)us-gaap_ServicingLiabilityAtFairValueOtherChangesInFairValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Fair value at March 31, 4,397us-gaap_ServicingLiabilityAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
1,221us-gaap_ServicingLiabilityAtFairValueAmount
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
 
Deferred Revenue | Fair Value, Measurements, Recurring      
Servicing Assets, Changes in fair value due to:      
Additions, included in other/deferred revenue 298us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RegulatoryAssetAxis
= ck0001409970_DeferredRevenueMember
0us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RegulatoryAssetAxis
= ck0001409970_DeferredRevenueMember
 
Servicing Liabilities, Changes in fair value due to:      
Additions, included in other/deferred revenue $ 0us-gaap_ServicingLiabilityAtFairValueAdditions
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RegulatoryAssetAxis
= ck0001409970_DeferredRevenueMember
$ 0us-gaap_ServicingLiabilityAtFairValueAdditions
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_RegulatoryAssetAxis
= ck0001409970_DeferredRevenueMember