Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Equipment and Software (Detail)

v2.4.1.9
Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Equipment and Software (Detail)
12 Months Ended
Dec. 31, 2014
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  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 4 years 3 months 18 days
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