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Business Combinations and Acquisitions of Noncontrolling Interests Business Acquisitions, Pro Forma Information (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |
|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2013
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Jun. 30, 2014
Ticket Monster [Member]
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Jun. 30, 2014
Ticket Monster [Member]
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Jun. 30, 2014
Ideeli [Member]
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Jun. 30, 2014
Ideeli [Member]
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| Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] | ||||||
| Business Acquisition, Pro Forma Revenue | $ 654,661,000 | $ 1,306,761,000 | ||||
| Business Acquisition, Pro Forma Net Income (Loss) | (28,508,000) | (56,932,000) | ||||
| Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | (10,200,000) | (23,800,000) | (700,000) | (3,200,000) | ||
| Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 35,400,000 | $ 64,600,000 | $ 21,600,000 | $ 37,500,000 |