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Stockholders' Equity and Stock-Based Compensation Groupon, Inc. Stock Plans (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share-based Compensation, Number of Shares Available for Grant | 46,569,481 | 46,569,481 | ||
| Stock-based compensation | $ 31,655,000 | $ 32,446,000 | $ 55,384,000 | $ 62,353,000 |
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount | 2,800,000 | 2,100,000 | 5,100,000 | 4,700,000 |
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 240,500,000 | $ 240,500,000 | ||
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 1 year 4 months 24 days | |||