Annual report pursuant to Section 13 and 15(d)

Acquisitions - Current Acquisition Activity (Details)

v3.8.0.1
Acquisitions - Current Acquisition Activity (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Feb. 28, 2017
Jan. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                    
Liabilities related to acquisitions           $ 13,000 $ 13,000 $ 13,000 $ 1,607  
Goodwill           751,052 751,052 751,052 259,938 $ 220,097
Gain (loss) due to changes in contingent cash payments               684 $ (877) $ (3,268)
LRO                    
Business Acquisition [Line Items]                    
Purchase price       $ 299,900            
Cash paid       298,000            
Deferred cash payment amount       1,600            
Deferred cash payment, fair value       1,500            
Liabilities related to acquisitions       400            
Goodwill       203,300   203,254 203,254 203,254    
Acquired receivables, gross contractual amount       4,600            
Acquired receivables, estimated uncollectible       (200)            
Direct acquisition costs       $ 13,800            
PEX                    
Business Acquisition [Line Items]                    
Purchase price $ 6,000                  
Cash paid 5,100                  
Deferred cash payment amount 1,000                  
Deferred cash payment, fair value 900                  
Goodwill 3,200         3,172 3,172 3,172    
Direct acquisition costs 400                  
Cash acquired from acquisition $ 100                  
Length of time after acquisition date of deferred cash payment to be made 24 months                  
On-Site                    
Business Acquisition [Line Items]                    
Purchase price   $ 253,400                
Cash paid   225,300                
Deferred cash payment amount   29,600                
Deferred cash payment, fair value   28,100                
Goodwill   184,500       184,534 184,534 184,534    
Acquired receivables, gross contractual amount   5,600                
Acquired receivables, estimated uncollectible   (900)                
Direct acquisition costs   1,800                
Cash acquired from acquisition   $ 1,700                
Length of time after acquisition date of deferred cash payment to be made   36 months                
Deferred cash payment period   12 months                
Goodwill purchase accounting adjustments           600        
Adjustment to intangibles           25,100        
Adjustment to property, plant, and equipment           (3,700)        
Adjustment to accounts receivable           (900)        
AUM                    
Business Acquisition [Line Items]                    
Purchase price     $ 69,400              
Cash paid     64,800              
Deferred cash payment amount     5,100              
Deferred cash payment, fair value     4,600              
Goodwill     45,900     45,929 45,929 45,929    
Acquired receivables, gross contractual amount     2,400              
Acquired receivables, estimated uncollectible     (300)              
Direct acquisition costs     300              
Cash acquired from acquisition     $ 100              
Deferred cash payment period     4 years              
Goodwill purchase accounting adjustments             (21,800)      
Adjustment to accounts payable and accrued liabilities             (500)      
Adjustment to customer deposits held in restricted accounts             1,700      
Adjustment to restricted cash             (1,700)      
Axiometrics                    
Business Acquisition [Line Items]                    
Purchase price         $ 73,800          
Cash paid         66,100          
Deferred cash payment amount         7,500          
Deferred cash payment, fair value         6,900          
Goodwill         54,200 54,190 54,190 54,190    
Direct acquisition costs         $ 300          
Deferred cash payment period         2 years          
Goodwill purchase accounting adjustments               1,300    
Liability for the estimated cash payment         $ 5,000          
Contingent cash payment fair value         $ 800          
Adjustment to deferred revenue               400    
Adjustment to accounts payable and accrued liabilities               (900)    
2017 Acquisitions                    
Business Acquisition [Line Items]                    
Liability for the estimated cash payment           200 200 200    
Aggregate deferred cash obligation           44,800 44,800 44,800    
Deferred cash obligation discount and indemnification obligations           $ 2,300 $ 2,300 2,300    
Gain (loss) due to changes in contingent cash payments               $ (600)    
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          
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          
Non-competition agreements | AUM                    
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          
Hart-Scott-Rodino Antitrust Improvements Act Review Process | LRO                    
Business Acquisition [Line Items]                    
Direct acquisition costs       $ 10,700