Quarterly report pursuant to Section 13 or 15(d)

Property, Equipment and Software - Additional Information (Detail)

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Property, Equipment and Software - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Property, Plant and Equipment [Line Items]        
Depreciation and amortization expense for property, equipment and software $ 3.3 $ 3.5 $ 7.3 $ 6.9
Decrease in depreciation and amortization expense 1.2   1.2  
Increase in net income $ 0.7   $ 0.7  
Increase in basic and diluted earnings per share $ 0.01   $ 0.01