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Business Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 05, 2016
Apr. 30, 2015
Apr. 30, 2015
Apr. 21, 2015
Mar. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Business Acquisition [Line Items]                
Cash consideration paid     $ 37,638     $ 271,458   $ 0
Cash on hand at signing   $ 3,789 3,789          
Business combination, earn-out payment           3,000   $ 0
Aesynt Holding, L.P., Aesynt, Ltd.                
Business Acquisition [Line Items]                
Cash consideration paid $ 271,458              
Cash on hand at signing 8,164              
Aggregate acquisition related costs $ 5,200              
Acquisition-related costs           2,300 $ 2,900  
Revenue of acquiree since acquisition date         $ 43,200      
Losses from acquiree since acquisition date         $ (9,500)      
Aesynt Holding, L.P., Aesynt, Ltd. | In-process R&D                
Business Acquisition [Line Items]                
Royalty rate 12.50%              
Aesynt Holding, L.P., Aesynt, Ltd. | Trade names                
Business Acquisition [Line Items]                
Royalty rate 0.50%              
Aesynt Holding, L.P., Aesynt, Ltd. | Customer relationships                
Business Acquisition [Line Items]                
Discount rate 13.00%              
Aesynt Holding, L.P., Aesynt, Ltd. | Backlog                
Business Acquisition [Line Items]                
Discount rate 10.00%              
Aesynt Holding, L.P., Aesynt, Ltd. | Non-compete                
Business Acquisition [Line Items]                
Discount rate 13.00%              
Aesynt Holding, L.P., Aesynt, Ltd. | Minimum                
Business Acquisition [Line Items]                
In process research and development, expected term 2 years              
Aesynt Holding, L.P., Aesynt, Ltd. | Minimum | Developed technology                
Business Acquisition [Line Items]                
Royalty rate 0.40%              
Aesynt Holding, L.P., Aesynt, Ltd. | Maximum                
Business Acquisition [Line Items]                
In process research and development, expected term 3 years              
Aesynt Holding, L.P., Aesynt, Ltd. | Maximum | Developed technology                
Business Acquisition [Line Items]                
Royalty rate 0.80%              
Mach4                
Business Acquisition [Line Items]                
Cash consideration paid       $ 16,889        
Cash on hand at signing       397        
Payment to acquire business, amount in cash after adjustments       17,300        
Amount placed in escrow fund for business acquisition       $ 2,700        
Revenue of acquiree since acquisition date           3,800    
Losses from acquiree since acquisition date           (1,700)    
Avantec                
Business Acquisition [Line Items]                
Cash consideration paid   20,749            
Cash on hand at signing   $ 3,392 $ 3,392          
Period after closing date to settle indemnification and other claims   18 months            
Percentage of interest acquired   85.00% 85.00%          
Payments to acquire business, gross   $ 12,000            
Business acquisition, potential earn-out payment   5,600 $ 5,600          
Business acquisition, amount withheld for indemnification   1,800 1,800          
Business combination, earn-out payment           3,000    
Revenue of acquiree since acquisition date           2,900    
Losses from acquiree since acquisition date           $ 800    
Avantec | Payable After December 31, 2015                
Business Acquisition [Line Items]                
Business acquisition, potential earn-out payment   3,000 3,000          
Avantec | Payable After December 31, 2016                
Business Acquisition [Line Items]                
Business acquisition, potential earn-out payment   $ 3,000 $ 3,000