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Pension and Other Retirement Benefits - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected rate of return on assets 7.85%    
Investment in securities rated below investment grade 3.00%    
Dividends paid on ESOP $ 0.4 $ 0.3  
Moody's share held in ESOP 580,000 610,000  
Year 2013
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected rate of return on assets 7.30%    
U.S. Defined Contribution Plans
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution compensation expense 24.5 14.9 19.4
International Defined Contribution Plans
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution compensation expense 18.8 16.3 11.8
Defined Contribution Plan
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employee contribution 50.00%    
Maximum employee contribution 3.00%    
Funded Plans
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions 17.8 13.6  
Anticipated contribution to plans 15.5    
Unfunded Plans
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions 3.5 11.8  
Anticipated contribution to plans 3.6    
Lump sum settlement payments   6.9  
Other Retirement Plans
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions 0.7 0.6  
Anticipated contribution to plans 0.8    
Discount rate 3.55% 4.05%  
Net actuarial losses 6.0 6.1  
Foreign Pension Plans, Defined Benefit
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit pension liabilities total 7.2 5.3 4.6
Discount rate 3.53% 4.79% 5.28%
Pension expense 0.6 0.6 0.5
Net actuarial losses 0.5    
Net actuarial gains, net of tax $ 0.3    
Equity Securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan asset, target asset allocation percentage 60.00%    
Plan asset, target asset allocation percentage, minimum 50.00%    
Plan asset, target asset allocation percentage, maximum 70.00%    
Debt Securities
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan asset, target asset allocation percentage 30.00%    
Plan asset, target asset allocation percentage, minimum 25.00%    
Plan asset, target asset allocation percentage, maximum 35.00%    
Real Estate
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan asset, target asset allocation percentage 10.00%    
Plan asset, target asset allocation percentage, minimum 7.00%    
Plan asset, target asset allocation percentage, maximum 13.00%    
Emerging Markets Bonds
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Investment in securities rated below investment grade 3.00%