Consolidated Core Companies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2012 MSDSonline [Member]	Jul. 11, 2012 Channel Intelligence [Member]	Jun. 29, 2012 Media IQ [Member]	Jul. 30, 2012 UAI [Member]
Net assets acquired:
Goodwill	$ 15,847	$ 47,055	$ 9,491	$ 3,676
Customer lists (8-11 year life)	20,440	11,000	6,200	1,750
Technology (5-10 year life)	1,900	5,530	900
Trademarks, trade names and domain names (11-15 year life)	6,800	7,600	600
Non-compete agreements (3-5 year life)	3,580		268	200
Licensing Agreements (2-10 year life)		4,140
Other net assets (liabilities)	1,170	2,927	316	1,101
Purchase price allocation assets acquired liabilities net	49,737	78,252	17,775	6,727
Noncontrolling interest	(1,355)	(33,589)
Purchase price allocation assets acquired	$ 48,382	$ 44,663	$ 17,775	$ 6,727

Amount of net tangible assets (liabilities) acquired as part of a business combination.

No definition available.

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- Definition

The amount of acquisition cost of business combination allocated to identifiable customer relationship intangible assets that will be amortized.

+ References

No definition available.

+ Details

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- Definition

Licensing agreements.

+ References

No definition available.

+ Details

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- Details

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- Definition

The amount of acquisition cost of business combination allocated to identifiable noncompete agreement intangible assets that will be amortized.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The amount of acquisition cost of business combination allocated to identifiable technology intangible assets that will be amortized.

+ References

No definition available.

+ Details

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- Definition

The amount of acquisition cost of business combination allocated to identifiable trademark, trade name and domain name intangible assets that will be amortized.

+ References

No definition available.

+ Details

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- Definition

The amount of acquisition cost of a business combination allocated to assets acquired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 35

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 53

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount of acquisition cost of a business combination allocated to noncontrolling interests.

+ References

No definition available.

+ Details

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