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.

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

Commitments and Contingencies Legal Matters (Details) - USD ($) $ in Millions	Sep. 30, 2017	Mar. 09, 2017
Loss Contingencies [Line Items]
Indemnification Liability, Maximum Exposure	$ 25.0
Groupon Latin America [Member]
Loss Contingencies [Line Items]
Indemnification Liability		$ 5.4