Quarterly report pursuant to Section 13 or 15(d)

Key Estimates and Assumptions used for Enterprise Valuations (Detail)

v2.4.0.6
Key Estimates and Assumptions used for Enterprise Valuations (Detail)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Discounted Cash Flow Pricing Model, by Assumption [Line Items]    
Discount rate 8.50% 8.50%
Long-term revenue growth rate ranges 1.50%  
Minimum
    
Discounted Cash Flow Pricing Model, by Assumption [Line Items]    
Operating profit margin ranges 1.40%  
Long-term revenue growth rate ranges 1.50% 1.50%
Maximum
    
Discounted Cash Flow Pricing Model, by Assumption [Line Items]    
Operating profit margin ranges 7.50%  
Long-term revenue growth rate ranges 2.50% 2.50%