Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended	9 Months Ended			9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2013	Mar. 31, 2012	Sep. 30, 2013 Bolt	Sep. 30, 2013 Msdsonline One	Sep. 30, 2013 Minimum	Sep. 30, 2013 Maximum	Sep. 30, 2013 Channel Intelligence	Sep. 30, 2013 Zurich Consolidated Revenue	Sep. 30, 2013 Zurich Consolidated Revenue
Significant Accounting Policies [Line Items]
Percentage of direct or indirect voting interest owned	More than 50%
Equity method investment, ownership percentage					20.00%	50.00%
Period of operation available for MSDSonline		Two days
Maintenance and customer support fees, contract life			1 year
Number of sources of revenues				3
Expiry period of contingent gains associated with outstanding escrows	2 years
Value of shares of common stock remaining in escrow						$ 0.2
Number of shares of common stock remaining in escrow	11,650
Proceeds from escrow releases							$ 7.9
Percentage of consolidated revenue								10.00%	10.00%