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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss) $ 29,936   $ 31,844
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 161    
Other Comprehensive Income (Loss), Net of Tax (2,069) $ 1,254  
Foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 29,394   30,962
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax 0    
Other Comprehensive Income (Loss), Net of Tax (1,568)    
Unrealized gain (loss) on available-for-sale securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 542   882
Other Comprehensive Income (Loss), Net of Tax (501)    
Total Groupon, Inc. Stockholders' Equity      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Net of Tax (2,069)    
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated other comprehensive income (loss) $ 29,936   $ 31,844