Annual report pursuant to Section 13 and 15(d)

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

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Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Equipment and Software (Detail)
12 Months Ended
Dec. 31, 2015
Data processing and communications equipment | Minimum  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life (in years) 3 years
Data processing and communications equipment | Maximum  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life (in years) 5 years
Furniture, fixtures and other equipment | Minimum  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life (in years) 3 years
Furniture, fixtures and other equipment | Maximum  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life (in years) 5 years
Software  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life (in years) 4 years 2 months 18 days
Software | Minimum  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life (in years) 3 years
Software | Maximum  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life (in years) 5 years
Leasehold improvements  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life (in years) 10 years