Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)

v2.4.0.6
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Segment
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Line Items]      
Number of reportable segments 5    
Advertising costs from continuing operation $ 48,700,000 $ 42,000,000 $ 32,600,000
Bad debt expense from continuing operations 2,100,000 2,800,000 800,000
Depreciation expense 75,000,000 75,000,000 72,200,000
Fixed assets ,Collateral 88,400,000 65,300,000  
Carrying value of debt 1,720,400,000 999,200,000  
Variable interest maximum exposure to loss 13,500,000    
Fair Value, Measurements, Recurring
     
Significant Accounting Policies [Line Items]      
Fair value of interest rate swaps 12,200,000 [1] 14,800,000  
Capitalized internal-use software and systems costs | Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Useful Life 10 years    
Capitalized internal-use software and systems costs | Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Useful Life 3 years    
Fixed Rate Debt
     
Significant Accounting Policies [Line Items]      
Fair value of debt 1,600,000,000 1,090,000,000  
Carrying value of debt $ 1,500,000,000 $ 970,000,000  
Data Processing Equipment, Capitalized Internal-Use Software and Systems Costs | Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Property Plant And Equipment Useful Life 5 years    
Data Processing Equipment, Capitalized Internal-Use Software and Systems Costs | Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Property Plant And Equipment Useful Life 3 years    
Building
     
Significant Accounting Policies [Line Items]      
Property Plant And Equipment Useful Life 40 years    
Other fixed assets | Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Property Plant And Equipment Useful Life 7 years    
Other fixed assets | Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Property Plant And Equipment Useful Life 3 years    
Stock Options
     
Significant Accounting Policies [Line Items]      
Antidilutive stock options excluded from computation of earnings per share 0.11 2.30 3.30
US Consumer Information Solutions
     
Significant Accounting Policies [Line Items]      
Percentage of revenue from a segment 42.00%    
[1] The fair value of our interest rate swaps, designated as fair value hedges, and notes are based on the present value of expected future cash flows using zero coupon rates and are classified within Level 2 of the fair value hierarchy.