Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Accounting Policies [Line Items]
Percentage of direct or indirect voting interest owned	more than 50%
Interest paid	$ 1.2		$ 0.1
Taxes paid	0.3	0.1
Taxes refunds received			6.5
Expiry period of contingent gains associated with outstanding escrows	2 years
Value of shares of common stock remaining in escrow	0.3
Maintenance and customer support fees, contract life	1 year
Msdsonline One
Significant Accounting Policies [Line Items]
Number of sources of revenues	3
Minimum
Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage	20.00%
Maximum
Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage	50.00%
Interest paid		0.1
Channel Intelligence
Significant Accounting Policies [Line Items]
Proceeds from escrow releases	$ 29.1
Zurich | Consolidated Revenue
Significant Accounting Policies [Line Items]
Percentage of consolidated revenue	10.00%	10.00%	10.00%