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Acquisitions - Schedule of Purchase Price Allocation (Parenthetical) (Detail) - Series of Individually Immaterial Business Acquisitions
9 Months Ended
Sep. 30, 2015
Trade Names [Member]  
Business Acquisition [Line Items]  
Weighted average useful lives 7 years
Customer Relationships [Member]  
Business Acquisition [Line Items]  
Weighted average useful lives 8 years