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CONSOLIDATED BALANCE SHEETS (Parenthetical) (Verisk Class A [Member], USD $)
Dec. 31, 2014
Dec. 31, 2013
Verisk Class A [Member]
   
Common stock, par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common stock authorized (in shares) 1,200,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
1,200,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common stock issued (in shares) 544,003,038us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
544,003,038us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common stock outstanding (in shares) 157,913,227us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
167,457,927us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Treasury stock (in shares) 386,089,811us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
376,545,111us-gaap_TreasuryStockShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember