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Employee Incentive and Retirement Plans - Schedule of Stock-Based Compensation Expense Recorded for Stock Options, Warrants and Series F Convertible Preferred Stock (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation, net $ 11,593us-gaap_ShareBasedCompensation $ 7,033us-gaap_ShareBasedCompensation
Sales and marketing    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 1,519us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
3,502us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingAndMarketingExpenseMember
Origination and servicing    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 721us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= ck0001409970_OriginationAndServicingExpenseMember
358us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= ck0001409970_OriginationAndServicingExpenseMember
General and administrative: | Engineering and product development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 1,406us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_ProductOrServiceAxis
= ck0001409970_EngineeringAndDevelopmentMember
737us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_ProductOrServiceAxis
= ck0001409970_EngineeringAndDevelopmentMember
General and administrative: | Other    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 7,947us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherExpenseMember
2,436us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_OtherExpenseMember
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 7,086us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
7,033us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Available for ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 479us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ck0001409970_EmployeeStockPurchasePlansMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ck0001409970_EmployeeStockPurchasePlansMember
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 481us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Springstone Financial, Llc    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 3,547us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_BusinessAcquisitionAxis
= ck0001409970_SpringstoneFinancialLlcMember
$ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_BusinessAcquisitionAxis
= ck0001409970_SpringstoneFinancialLlcMember