Quarterly report pursuant to Section 13 or 15(d)

Acquisitions -2017 Acquisitions (Details)

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Acquisitions -2017 Acquisitions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2017
Aug. 31, 2017
Jun. 30, 2017
Feb. 28, 2017
Jan. 31, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]                  
Goodwill $ 565,425         $ 565,425 $ 565,425   $ 259,938
Gain (loss) recognized due to change in fair value of cash consideration             (382) $ 499  
Lease Rent Options                  
Business Acquisition [Line Items]                  
Cash portion of purchase price       $ 298,500          
Deferred cash payment amount related to acquisition       $ 1,500          
Length of time for acquisition deferred cash payment to be made       12 months          
Extended agreement period   6 months              
Agreement termination period   20 days              
Reimbursable legal fees   50.00%              
On-Site                  
Business Acquisition [Line Items]                  
Cash portion of purchase price 226,000                
Deferred cash payment amount related to acquisition $ 29,000                
Length of time for acquisition deferred cash payment to be made 12 months                
Total purchase price $ 253,400                
Cash acquired 3,700                
Fair value of deferred cash payment $ 27,400         27,400 27,400    
Length of time for acquisition contingent cash payment to be made 36 months                
Goodwill $ 206,342         206,342 206,342    
Acquisition costs 1,400         1,400 1,400    
AUM                  
Business Acquisition [Line Items]                  
Cash portion of purchase price     $ 64,800            
Deferred cash payment amount related to acquisition     $ 5,100            
Length of time for acquisition deferred cash payment to be made     4 years            
Total purchase price     $ 69,400            
Cash acquired     100            
Fair value of deferred cash payment     4,600            
Goodwill 44,935   44,900     44,935 44,935    
Acquisition costs     $ 300            
Goodwill, purchase accounting adjustments           (400)      
Axiometrics                  
Business Acquisition [Line Items]                  
Cash portion of purchase price         $ 66,100        
Deferred cash payment amount related to acquisition         $ 7,500        
Length of time for acquisition deferred cash payment to be made         2 years        
Total purchase price         $ 73,800        
Fair value of deferred cash payment         $ 6,900        
Length of time for acquisition contingent cash payment to be made         12 months        
Goodwill 54,174       $ 54,200 54,174 54,174    
Acquisition costs         300        
Goodwill, purchase accounting adjustments           1,300      
Contingent cash obligation/payment         5,000        
Fair value of contingent cash payment         $ 800        
Adjustment in purchase price allocated to deferred revenue           400      
Adjustment in purchase price allocated to accounts payable and accrued liabilities           900      
2017 Acquisitions                  
Business Acquisition [Line Items]                  
Contingent cash obligation/payment 300         300 300    
Deferred cash obligation 41,500         41,500 41,500    
Deferred cash obligation discount $ (2,800)         (2,800) (2,800)    
Gain (loss) recognized due to change in fair value of cash consideration           $ 300 $ 500    
Developed product technologies | On-Site                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets 5 years                
Developed product technologies | AUM                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets     3 years            
Developed product technologies | Axiometrics                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets         5 years        
Client relationships | On-Site                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets 10 years                
Client relationships | AUM                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets     10 years            
Client relationships | Axiometrics                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets         10 years        
Trade names | On-Site                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets 2 years                
Trade names | AUM                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets     2 years            
Trade names | Axiometrics                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets         3 years        
Non-compete agreements | AUM                  
Business Acquisition [Line Items]                  
Amortized useful life of acquired intangible assets     5 years