Description of Business and Summary of Significant Accounting Policies - Fixed Assets and Computer Software, Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2013
Building and building improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	8 years
Building and building improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	30 years
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	8 years
Computer and data processing equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years
Capitalized software
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Useful life for capitalization	1 year
Other | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Other | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years