Annual report pursuant to Section 13 and 15(d)

Estimated Useful Lives of Property, Equipment and Software (Detail)

v2.4.0.6
Estimated Useful Lives of Property, Equipment and Software (Detail)
12 Months Ended
Dec. 31, 2012
Leasehold Improvements | Minimum
 
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 1 year
Leasehold Improvements | Maximum
 
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 10 years
Data processing and communications equipment | Minimum
 
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 1 year
Data processing and communications equipment | Maximum
 
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 10 years
Furniture, fixtures and other equipment | Minimum
 
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 1 year
Furniture, fixtures and other equipment | Maximum
 
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 5 years
Software | Minimum
 
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 1 year
Software | Maximum
 
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 5 years