XML 88 R52.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Stockholders' Equity and Compensation Arrangements Employee Stock Purchase Plan (Details) - shares | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Equity [Abstract] |  |
Employee Stock Purchase Plan, shares authorized | 10,000,000 |
Employee Stock Purchase Plan, issued shares | 1,879,656 | 1,669,782

X
- Definition Employee Stock Purchase Plan, shares authorized + References No definition available. + Details
Name: | grpn_EmployeeStockPurchasePlanSharesAuthorized
Namespace Prefix: | grpn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Employee Stock Purchase Plan, issued shares + References No definition available. + Details
Name: | grpn_EmployeeStockPurchasePlanissuedshares
Namespace Prefix: | grpn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration