Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS - Additional Information (Detail)

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GOODWILL AND INTANGIBLE ASSETS - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization expense related to purchased intangible assets $ 33.0 $ 33.9 $ 98.3 $ 90.4  
Goodwill 2,624.6   2,624.6   2,395.1
U.S. Information Solutions [Member]
          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill 1,120.6   1,120.6   1,054.2 [1]
U.S. Information Solutions [Member] | Legacy NACS [Member]
          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill         21.7
International [Member]
          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill 579.7   579.7   416.5 [1]
International [Member] | Legacy NACS [Member]
          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill         $ 15.5
[1] The December 31, 2013 balances have been recast to reflect the new organizational structure. As of December 31, 2013, the USIS and International goodwill include $21.7 million and $15.5 million of goodwill, respectively, from the legacy NACS segment.