Annual report pursuant to Section 13 and 15(d)

Property, Equipment and Software - Additional Information (Detail)

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Property, Equipment and Software - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense for property, equipment and software $ 15.1 $ 14.2 $ 12.9