ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Business Combinations (Details)	Dec. 31, 2011
Business Acquisition [Line Items]
Business Acquisitions, Percentage Of Assets and Liabilities, Including Goodwill, Recorded At Fair Value	100.00%

Business Acquisitions Percentage Of Assets and Liabilities Including Goodwill Recorded At Fair Value

No definition available.

Name:	vclk_BusinessAcquisitionsPercentageOfAssetsAndLiabilitiesIncludingGoodwillRecordedAtFairValue
Namespace Prefix:	vclk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant