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Property, Equipment and Software, Net (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, equipment and software, gross $ 377,594,000us-gaap_PropertyPlantAndEquipmentGross $ 244,700,000us-gaap_PropertyPlantAndEquipmentGross  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (195,119,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (110,277,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, equipment and software, net 182,475,000us-gaap_PropertyPlantAndEquipmentNet 134,423,000us-gaap_PropertyPlantAndEquipmentNet  
Capital Leased Assets, Gross 48,000,000us-gaap_CapitalLeasedAssetsGross 11,800,000us-gaap_CapitalLeasedAssetsGross  
Depreciation and amortization of property, equipment and software 97,799,000us-gaap_DepreciationDepletionAndAmortization 67,823,000us-gaap_DepreciationDepletionAndAmortization 35,891,000us-gaap_DepreciationDepletionAndAmortization
Capital Leases, Income Statement, Amortization Expense 7,200,000us-gaap_CapitalLeasesIncomeStatementAmortizationExpense 2,100,000us-gaap_CapitalLeasesIncomeStatementAmortizationExpense  
Capitalized Computer Software, Net 61,800,000us-gaap_CapitalizedComputerSoftwareNet 47,900,000us-gaap_CapitalizedComputerSoftwareNet  
Capitalized Computer Software, Amortization 42,100,000us-gaap_CapitalizedComputerSoftwareAmortization 25,200,000us-gaap_CapitalizedComputerSoftwareAmortization 3,400,000us-gaap_CapitalizedComputerSoftwareAmortization
Warehouse equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, equipment and software, gross 4,859,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
3,997,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
 
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property, equipment and software, gross 18,610,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
13,526,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
 
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, equipment and software, gross 39,900,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
35,830,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Office and telephone equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, equipment and software, gross 4,448,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
5,062,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
 
Purchased Software [Member]      
Property, Plant and Equipment [Line Items]      
Property, equipment and software, gross 40,448,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
22,499,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
 
Computer hardware [Member]      
Property, Plant and Equipment [Line Items]      
Property, equipment and software, gross 135,731,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
[1] 84,673,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
[1]  
Internally-developed software [Member]      
Property, Plant and Equipment [Line Items]      
Property, equipment and software, gross 133,598,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
79,113,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
 
Selling, General and Administrative Expenses [Member]      
Property, Plant and Equipment [Line Items]      
Capitalized Computer Software, Amortization 30,400,000us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
17,300,000us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
 
Cost of Sales [Member]      
Property, Plant and Equipment [Line Items]      
Capitalized Computer Software, Amortization $ 11,700,000us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
$ 7,900,000us-gaap_CapitalizedComputerSoftwareAmortization
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
 
[1] (1)Includes computer hardware acquired under capital leases of $48.0 million and $11.8 million as of December 31, 2014 and 2013, respectively.