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Segment Reporting - Consolidated Sales Revenues by Similar Products and Services (Detail) (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net revenues | $ 112,183,360 | $ 88,844,059 | $ 214,909,107 | $ 172,580,065
Marketplace [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net revenues | 77,915,508 | 61,936,103 | 149,630,271 | 122,218,201
Non-marketplace [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Net revenues | $ 34,267,852 | $ 26,907,956 | $ 65,278,836 | $ 50,361,864

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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