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Segment Reporting - Consolidated Net Revenues by Similar Products and Services (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 131,849,139	$ 112,183,360	$ 247,231,460	$ 214,909,107
Marketplace [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	91,517,242	77,915,508	174,959,772	149,630,271
Non-marketplace [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net revenues	$ 40,331,897	$ 34,267,852	$ 72,271,688	$ 65,278,836

X

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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