Quarterly report pursuant to Section 13 or 15(d)

Property, Equipment and Software - Additional Information (Details)

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Property, Equipment and Software - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Property, Plant and Equipment [Abstract]        
Depreciation and amortization expense for property, equipment and software $ 4.9 $ 3.3 $ 9.4 $ 7.3