Annual report pursuant to Section 13 and 15(d)

Acquisitions - 2016 Acquisitions (Details)

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Acquisitions - 2016 Acquisitions (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2016
May 31, 2016
Mar. 31, 2016
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]              
Goodwill         $ 751,052,000 $ 259,938,000 $ 220,097,000
Payments of acquisition-related consideration         8,491,000 5,684,000 3,685,000
Deferred tax asset related to net operating loss carryforwards         42,119,000 16,193,000  
Gain (loss) due to changes in contingent cash payments         684,000 (877,000) $ (3,268,000)
eSupply              
Business Acquisition [Line Items]              
Purchase price $ 7,000,000            
Cash paid 5,500,000            
Deferred cash payment amount $ 1,600,000            
Length of time after acquisition date of deferred cash payment to be made 18 months            
Deferred cash payment, fair value $ 1,500,000            
Goodwill $ 3,200,000       3,194,000    
Deferred tax assets, net         0    
AssetEye              
Business Acquisition [Line Items]              
Purchase price   $ 4,900,000          
Cash paid   3,600,000          
Deferred cash payment amount   $ 1,000,000          
Length of time after acquisition date of deferred cash payment to be made   2 years          
Deferred cash payment, fair value   $ 900,000          
Goodwill   3,200,000     3,154,000    
Cash acquired from acquisition   800,000          
Liability for the estimated cash payment   1,000,000          
Additional cash payments   200,000          
Fair value of contingent cash obligation   200,000          
Deferred tax assets, net         0    
Deferred tax asset related to net operating loss carryforwards   $ 0          
NWP              
Business Acquisition [Line Items]              
Purchase price     $ 68,200,000        
Cash paid     59,000,000        
Deferred cash payment amount     $ 7,200,000        
Length of time after acquisition date of deferred cash payment to be made     3 years        
Deferred cash payment, fair value     $ 6,000,000        
Goodwill     35,300,000   33,520,000    
Cash acquired from acquisition     100,000        
Other consideration transferred     3,200,000        
Payments of acquisition-related consideration         1,000,000    
Intangible assets     16,300,000        
Goodwill, expected tax deductible amount     700,000        
Intangible assets, expected tax deductible amount     11,000,000        
Acquired receivables, gross contractual amount     11,300,000        
Acquired receivables, estimated uncollectible     3,400,000        
Deferred tax assets, net     10,200,000   11,173,000    
Direct acquisition costs     300,000        
Indemnification asset     $ 1,200,000        
Adjustment to indemnification asset         900,000    
Goodwill, period increase (decrease)         (1,800,000)    
Change in deferred cash obligation         (800,000)    
Payments due to certain employees and former shareholders         100,000    
2016 Acquisitions              
Business Acquisition [Line Items]              
Deferred cash payment amount         1,800,000 100,000  
Liability for the estimated cash payment         200,000 500,000  
Aggregate deferred cash obligation         6,900,000 8,700,000  
Deferred cash obligation discount         (2,600,000) (1,200,000)  
Gain (loss) due to changes in contingent cash payments       $ 300,000 300,000    
Payments due to certain employees and former shareholders           $ 3,300,000  
Developed product technologies | eSupply              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets 3 years            
Intangible assets         2,160,000    
Developed product technologies | AssetEye              
Business Acquisition [Line Items]              
Intangible assets         1,638,000    
Developed product technologies | NWP              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets     5 years        
Intangible assets         2,740,000    
Client relationships | eSupply              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets 10 years            
Intangible assets         1,390,000    
Client relationships | AssetEye              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets   10 years          
Intangible assets         1,041,000    
Client relationships | NWP              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets     10 years        
Intangible assets         12,900,000    
Trade names | eSupply              
Business Acquisition [Line Items]              
Intangible assets         35,000    
Trade names | AssetEye              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets   5 years          
Intangible assets         6,000    
Trade names | NWP              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets     3 years        
Intangible assets         709,000    
Federal and State Jurisdictions | NWP              
Business Acquisition [Line Items]              
Deferred tax asset related to net operating loss carryforwards     $ 9,900,000        
Deferred tax assets, tax benefit from operating loss carryforwards arising from various limitations and restrictions on business acquisition     $ 27,300,000        
Deferred Tax Asset | NWP              
Business Acquisition [Line Items]              
Adjustment to deferred taxes         $ 1,000,000