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Acquisition - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Aug. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Business Acquisition [Line Items]        
Aggregate purchase price   $ 1,331,079 $ 9,239  
Cash acquired from acquisition   51,400    
Deferred payments of previous acquisitions   5,300   $ 3,400
Masternaut        
Business Acquisition [Line Items]        
Additional investment   7,900   8,400
Recovery of purchase price   9,300    
STP        
Business Acquisition [Line Items]        
Cash acquired from acquisition $ 40,300      
Aggregate purchase price $ 1,250,000      
Other        
Business Acquisition [Line Items]        
Cash acquired from acquisition   11,100    
Aggregate purchase price   $ 76,700    
2015 Acquisitions        
Business Acquisition [Line Items]        
Aggregate purchase price       $ 46,300