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Business Acquisitions - 2016 Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jun. 16, 2016
Mar. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]          
Businesses purchased, net of cash acquired     $ 29,559 $ 19,932 $ 74,766
Contingent consideration, current     14,992 $ 19,244  
Contingent consideration, noncurrent     20,800    
Rialco Limited [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Businesses purchased, net of cash acquired   $ 8,400      
Fair value of earnout     3,400    
Contingent consideration, current     1,300    
Contingent consideration, noncurrent     $ 2,100    
Rialco Limited [Member] | Earnout [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Fair value discount rate     0.80%    
Optitex Ltd [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Contingent consideration, current     $ 9,100    
Contingent consideration, noncurrent     11,800    
Optitex Ltd [Member] | Productivity Software [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Businesses purchased, net of cash acquired $ 11,600        
Fair value of earnout     $ 20,900    
Optitex Ltd [Member] | Earnout [Member] | Productivity Software [Member]          
Acquired Finite-Lived Intangible Assets [Line Items]          
Fair value discount rate     3.39%