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Property, Plant and Equipment - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Business
Dec. 31, 2014
USD ($)
Business
Dec. 31, 2013
USD ($)
Property, Plant and Equipment [Abstract]      
Property, plant and equipment acquired $ 59.1 $ 168.5  
Number of businesses acquired | Business 2 4  
Depreciation expense $ 31.5 $ 20.8 $ 17.0