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 6 Months Ended
Oct. 31, 2017
Sep. 30, 2017
Aug. 31, 2017
Jun. 30, 2017
Feb. 28, 2017
Jan. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]                        
Acquisition of businesses, net of cash and restricted cash acquired                 $ 137,475 $ 123,241    
Goodwill             $ 918,785   918,785   $ 751,052  
Gain (loss) recognized due to change in fair value of cash consideration                 (1,124) (1,024)    
Payments of acquisition-related consideration                 7,371 7,185    
LRO                        
Business Acquisition [Line Items]                        
Total purchase price         $ 299,900              
Cash paid         298,000              
Deferred cash payment amount related to acquisition         1,600              
Deferred cash obligations, net         1,500              
Liabilities assumed         400              
Goodwill         202,900   202,852   202,852      
Gross contractual amount of acquired receivables         4,700              
Estimated uncollectable amount of acquired receivables         200              
Acquisition costs         $ 13,800              
Reimbursable legal fees     50.00%                  
Total purchase price             299,923   299,923      
PEX                        
Business Acquisition [Line Items]                        
Total purchase price $ 6,000                      
Acquisition of businesses, net of cash and restricted cash acquired 5,100                      
Deferred cash payment amount related to acquisition 1,000                      
Deferred cash obligations, net 900                      
Goodwill 3,300           3,309   3,309      
Acquisition costs 400                      
Total purchase price             6,031   6,031      
Cash acquired $ 100                      
Length of time for acquisition contingent cash payment to be made 24 months                      
On-Site                        
Business Acquisition [Line Items]                        
Total purchase price   $ 253,400                    
Acquisition of businesses, net of cash and restricted cash acquired   225,300                    
Deferred cash payment amount related to acquisition   29,600                    
Deferred cash obligations, net   $ 28,100                    
Length of time for acquisition deferred cash payment to be made   12 months                    
Goodwill   $ 184,500         184,520   184,520      
Gross contractual amount of acquired receivables   5,600                    
Estimated uncollectable amount of acquired receivables   900                    
Acquisition costs   1,800                    
Total purchase price             253,430   253,430      
Cash acquired   $ 1,700                    
Length of time for acquisition contingent cash payment to be made   36 months                    
AUM                        
Business Acquisition [Line Items]                        
Acquisition of businesses, net of cash and restricted cash acquired       $ 64,800                
Deferred cash payment amount related to acquisition       5,100                
Deferred cash obligations, net       $ 4,600       $ 4,600   4,600    
Length of time for acquisition deferred cash payment to be made       4 years                
Goodwill       $ 45,900     45,907 45,900 45,907 45,900    
Gross contractual amount of acquired receivables       2,700       2,700   2,700    
Estimated uncollectable amount of acquired receivables       300       300   300    
Acquisition costs       300                
Total purchase price       69,400     69,412 69,400 69,412 69,400    
Cash acquired       $ 100                
Axiometrics                        
Business Acquisition [Line Items]                        
Cash paid           $ 66,100            
Deferred cash payment amount related to acquisition           7,500            
Deferred cash obligations, net           $ 6,900            
Length of time for acquisition deferred cash payment to be made           2 years            
Goodwill           $ 54,200 54,190   54,190      
Acquisition costs           300            
Total purchase price           $ 73,800 73,757   73,757      
Length of time for acquisition contingent cash payment to be made           12 months            
Contingent cash obligation/payment           $ 5,000            
Contingent consideration liability           $ 800            
2017 Acquisitions                        
Business Acquisition [Line Items]                        
Deferred cash payment amount related to acquisition                 6,000      
Deferred cash obligation             38,200   38,200   44,800  
Deferred cash obligation discount             800   800   2,300  
Gain (loss) recognized due to change in fair value of cash consideration             100 200        
Developed product technologies | LRO                        
Business Acquisition [Line Items]                        
Amortized useful life of acquired intangible assets         7 years              
Developed product technologies | PEX                        
Business Acquisition [Line Items]                        
Amortized useful life of acquired intangible assets 7 years                      
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 | LRO                        
Business Acquisition [Line Items]                        
Amortized useful life of acquired intangible assets         10 years              
Client relationships | PEX                        
Business Acquisition [Line Items]                        
Amortized useful life of acquired intangible assets 9 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 | LRO                        
Business Acquisition [Line Items]                        
Amortized useful life of acquired intangible assets         2 years              
Trade names | PEX                        
Business Acquisition [Line Items]                        
Amortized useful life of acquired intangible assets 6 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                
Hart-Scott-Rodino Antitrust Improvements Act Review Process | LRO                        
Business Acquisition [Line Items]                        
Acquisition costs         $ 10,700              
Recurring                        
Business Acquisition [Line Items]                        
Liabilities measured at fair value             52   52   414  
Contingent Consideration | Recurring | Axiometrics                        
Business Acquisition [Line Items]                        
Liabilities measured at fair value             52   52   167  
Level 3 | Recurring                        
Business Acquisition [Line Items]                        
Liabilities measured at fair value             52   52   414  
Level 3 | Contingent Consideration                        
Business Acquisition [Line Items]                        
Liabilities measured at fair value       $ 1,394     52 $ 1,394 52 $ 1,394 414 $ 541
Level 3 | Contingent Consideration | Recurring | Axiometrics                        
Business Acquisition [Line Items]                        
Liabilities measured at fair value             52   52   167  
Level 3 | Contingent Consideration | Recurring | 2017 Acquisitions                        
Business Acquisition [Line Items]                        
Liabilities measured at fair value             $ 100   $ 100   $ 200