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Purchase Price Allocation (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Mar. 01, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Indemnification asset $ 16.9 $ 16.5    
Goodwill $ 1,054.5 $ 1,023.6   $ 976.3
Gilliland Gold Young (GGY) [Member]        
Business Acquisition [Line Items]        
Current assets     $ 11.7  
Property and equipment, net     2.0  
Indemnification asset     1.5  
Total intangible assets     34.1  
Goodwill     59.4  
Liabilities assumed     (22.2)  
Net assets acquired     86.5  
Gilliland Gold Young (GGY) [Member] | Trade Names [Member]        
Business Acquisition [Line Items]        
Total intangible assets     3.7  
Gilliland Gold Young (GGY) [Member] | Customer Relationships [Member]        
Business Acquisition [Line Items]        
Total intangible assets     13.8  
Gilliland Gold Young (GGY) [Member] | Software [Member]        
Business Acquisition [Line Items]        
Total intangible assets     $ 16.6