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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Dividends paid on ESOP $ 0.5 $ 0.4  
Moody's share held in ESOP 520,000 580,000  
Year 2013
     
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected rate of return on assets 7.30%    
Year 2014
     
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected rate of return on assets 6.80%    
U.S. Defined Contribution Plans
     
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution compensation expense 18.8 24.5 14.9
International Defined Contribution Plans
     
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution compensation expense 19.7 18.8 16.3
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 16.8 17.8  
Anticipated contribution to plans 20.4    
Unfunded Plans
     
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions 2.5 3.5  
Anticipated contribution to plans 6.2    
Other Retirement Plans
     
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Expected rate of return on assets 0.00% 0.00% 0.00%
Employer contributions 0.6 0.7  
Anticipated contribution to plans 0.8    
Lump sum settlement payments 0 0 0
Discount rate 4.45% 3.55%  
Net actuarial losses (2.4) (6.0)  
Foreign Pension Plans, Defined Benefit
     
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit pension liabilities total 7.8 7.2 5.3
Discount rate 3.58% 3.53% 4.79%
Pension expense $ 0.6 $ 0.6 $ 0.6
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]      
Investment in securities rated below investment grade 3.00%    
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%    
Fixed Income 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%    
Other Investments
     
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%