Leases - Narrative (Details)	Dec. 31, 2019 USD ($) ft²
Corporate Headquarters
Lessee, Lease, Description [Line Items]
Area of real estate property (in sqft) \| ft²	225,135
Lessee, finance lease, term of contract	25 years
Lease Arrangements, Hosting \| DFS
Lessee, Lease, Description [Line Items]
Lessee, finance lease, term of contract	36 months
Lessee, finance lease, discount rate	0.00%
Lessee, finance lease, buy-out option, amount	$ 1
Lease Arrangements, Hosting and Computer Equipment \| ePlus
Lessee, Lease, Description [Line Items]
Lessee, finance lease, term of contract	36 months
Lessee, finance lease, buy-out option, amount	$ 1
Lease Arrangements, Hosting and Computer Equipment \| ePlus \| Minimum
Lessee, Lease, Description [Line Items]
Lessee, finance lease, discount rate	3.71%
Lease Arrangements, Hosting and Computer Equipment \| ePlus \| Maximum
Lessee, Lease, Description [Line Items]
Lessee, finance lease, discount rate	6.94%

Lessee, Finance Lease, Buy-Out Option, Amount

No definition available.

Name:	etsy_LesseeFinanceLeaseBuyOutOptionAmount
Namespace Prefix:	etsy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Discount rate used by lessee to determine present value of finance lease payments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeFinanceLeaseDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeFinanceLeaseTermOfContract1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	etsy_LeaseArrangementsAxis=etsy_LeaseArrangementsHostingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=etsy_DellFinancialServicesLLC.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	etsy_LeaseArrangementsAxis=etsy_LeaseArrangementsHostingAndComputerEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=etsy_EPlusGroupInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: