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Estimated Useful Lives of Intangible Assets Acquired (Detail)
9 Months Ended
Sep. 30, 2013
Customer-Related Intangible Assets | Minimum
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful lives 1 year
Customer-Related Intangible Assets | Maximum
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful lives 14 years
Marketing-Related Intangible Assets | Minimum
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful lives 1 year
Marketing-Related Intangible Assets | Maximum
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful lives 10 years
Contract-Related Intangible Assets
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful lives 1 year
Other Intangible Assets | Minimum
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful lives 3 years
Other Intangible Assets | Maximum
 
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful lives 9 years