Goodwill and Intangibles Assets (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Activity related to Goodwill
Goodwill, Gross Carrying Amount at December 31, 2011	$ 22,538
Goodwill, Accumulated Impairment Losses at December 31, 2012
Goodwill, Net Carrying Amount at December 31, 2011	22,538
Increase in goodwill, Gross Carrying Amount	13,823
Increase in goodwill, Accumulated Impairment Losses
Increase in goodwill, Net Carrying Amount	13,823
Goodwill, Gross Carrying Amount at September 30, 2012	99,263
Goodwill, Accumulated Impairment Losses at September 30, 2012
Goodwill, Net Carrying Amount at September 30, 2012	99,263
MSDSonline [Member]
Activity related to Goodwill
Increase in goodwill, Gross Carrying Amount	15,847
Increase in goodwill, Accumulated Impairment Losses
Increase in goodwill, Net Carrying Amount	15,847
Channel Intelligence [Member]
Activity related to Goodwill
Increase in goodwill, Gross Carrying Amount	47,055
Increase in goodwill, Accumulated Impairment Losses
Increase in goodwill, Net Carrying Amount	$ 47,055

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details