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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 | $ 377,594,000 us-gaap_PropertyPlantAndEquipmentGross |  | $ 244,700,000 us-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 | 182,475,000 us-gaap_PropertyPlantAndEquipmentNet |  | 134,423,000 us-gaap_PropertyPlantAndEquipmentNet |  |
Capital Leased Assets, Gross | 48,000,000 us-gaap_CapitalLeasedAssetsGross |  | 11,800,000 us-gaap_CapitalLeasedAssetsGross |  |
Depreciation and amortization of property, equipment and software | 97,799,000 us-gaap_DepreciationDepletionAndAmortization |  | 67,823,000 us-gaap_DepreciationDepletionAndAmortization |  | 35,891,000 us-gaap_DepreciationDepletionAndAmortization
Capital Leases, Income Statement, Amortization Expense | 7,200,000 us-gaap_CapitalLeasesIncomeStatementAmortizationExpense |  | 2,100,000 us-gaap_CapitalLeasesIncomeStatementAmortizationExpense |  |
Capitalized Computer Software, Net | 61,800,000 us-gaap_CapitalizedComputerSoftwareNet |  | 47,900,000 us-gaap_CapitalizedComputerSoftwareNet |  |
Capitalized Computer Software, Amortization | 42,100,000 us-gaap_CapitalizedComputerSoftwareAmortization |  | 25,200,000 us-gaap_CapitalizedComputerSoftwareAmortization |  | 3,400,000 us-gaap_CapitalizedComputerSoftwareAmortization
Warehouse equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, equipment and software, gross | 4,859,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember |  | 3,997,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember |  |
Furniture and Fixtures [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, equipment and software, gross | 18,610,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |  | 13,526,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |  |
Leasehold Improvements [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, equipment and software, gross | 39,900,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |  | 35,830,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |  |
Office and telephone equipment [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, equipment and software, gross | 4,448,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember |  | 5,062,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OfficeEquipmentMember |  |
Purchased Software [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, equipment and software, gross | 40,448,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember |  | 22,499,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember |  |
Computer hardware [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, equipment and software, gross | 135,731,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember | [1] | 84,673,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember | [1] |
Internally-developed software [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property, equipment and software, gross | 133,598,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareDevelopmentMember |  | 79,113,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareDevelopmentMember |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Capitalized Computer Software, Amortization | 30,400,000 us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  | 17,300,000 us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  |
Cost of Sales [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Capitalized Computer Software, Amortization | $ 11,700,000 us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  | $ 7,900,000 us-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.

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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