Condensed Consolidated Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Condensed Consolidated Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Textual) [Abstract]
Allowance for doubtful accounts	$ 3,990		$ 4,158
Net of cash acquired from acquisitions	29,387	0
Verisk Analytics, Inc.[Member]
Condensed Consolidated Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Textual) [Abstract]
Allowance for doubtful accounts	3,990		4,158
Percent of corporate wholly-owned subsidiaries			100.00%
Guarantor Subsidiaries [Member]
Condensed Consolidated Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Textual) [Abstract]
Allowance for doubtful accounts	3,990		4,158
Net of cash acquired from acquisitions	29,387
Non- Guarantor Subsidiaries [Member]
Condensed Consolidated Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Textual) [Abstract]
Allowance for doubtful accounts	3,990		4,158
Eliminating Entries [Member]
Condensed Consolidated Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries (Textual) [Abstract]
Allowance for doubtful accounts	$ 3,990		$ 4,158