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(Details)
$ in Thousands
 2 Months Ended 9 Months Ended
Apr. 30, 2016
USD ($)
business_acquisition
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]        
Cash consideration   $ 104,353 $ 65,405  
Goodwill   $ 146,459   $ 57,095
Series of Individually Immaterial Business Acquisitions [Member]        
Business Acquisition [Line Items]        
Number of businesses acquired | business_acquisition 2      
Cash consideration $ 104,000      
Identifiable intangible assets 17,400      
Net deferred tax liabilities 3,400      
Goodwill 89,000      
Deferred cash and stock compensation $ 37,000