Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - 2016 Acquisitions (Details)

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Acquisitions - 2016 Acquisitions (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2016
May 31, 2016
Mar. 31, 2016
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                
Goodwill       $ 565,425,000 $ 259,938,000 $ 565,425,000    
Gain (loss) recognized due to change in fair value of cash consideration           (382,000) $ 499,000  
eSupply, Systems, LLC                
Business Acquisition [Line Items]                
Total purchase price $ 7,000,000              
Cash portion of purchase price 5,500,000              
Deferred cash payment amount related to acquisition $ 1,600,000              
Length of time for acquisition deferred cash payment to be made 18 months              
Fair value of deferred cash payment $ 1,500,000              
Goodwill $ 3,200,000     3,194,000   3,194,000    
Deferred tax assets, net       0   0    
eSupply, Systems, LLC | Developed product technologies                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 3 years              
Intangible assets acquired       2,160,000   2,160,000    
eSupply, Systems, LLC | Trade names                
Business Acquisition [Line Items]                
Intangible assets acquired       35,000   35,000    
eSupply, Systems, LLC | Client relationships                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 10 years              
Intangible assets acquired       1,390,000   1,390,000    
NWP                
Business Acquisition [Line Items]                
Total purchase price     $ 68,200,000          
Cash portion of purchase price     59,000,000          
Deferred cash payment amount related to acquisition     $ 7,200,000          
Length of time for acquisition deferred cash payment to be made     3 years          
Fair value of deferred cash payment     $ 6,000,000          
Goodwill     35,300,000 33,520,000   33,520,000    
Cash acquired     100,000          
Other payments     3,200,000          
Acquisition costs     300,000          
Intangible assets acquired     16,300,000          
Goodwill carryover tax base     700,000          
Intangible assets acquired carryover tax base     11,000,000          
Gross contractual amount of acquired receivables     11,300,000          
Estimated uncollectable amount of acquired receivables     3,400,000          
Deferred tax assets, net     10,200,000 11,173,000   11,173,000    
Indemnification asset recorded     1,200,000          
Goodwill, purchase accounting adjustments         (1,800,000)      
Change in deferred cash obligation         (800,000)      
NWP | Federal and State Jurisdictions                
Business Acquisition [Line Items]                
Federal and State NOL     9,900,000          
Tax benefit from NOLs     $ 27,300,000          
NWP | Developed product technologies                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets     5 years          
Intangible assets acquired       2,740,000   2,740,000    
NWP | Trade names                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets     3 years          
Intangible assets acquired       709,000   709,000    
NWP | Client relationships                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets     10 years          
Intangible assets acquired       12,900,000   12,900,000    
AssetEye, Inc.                
Business Acquisition [Line Items]                
Total purchase price   $ 4,900,000            
Cash portion of purchase price   3,600,000            
Deferred cash payment amount related to acquisition   $ 1,000,000            
Length of time for acquisition deferred cash payment to be made   2 years            
Fair value of deferred cash payment   $ 900,000            
Goodwill   3,200,000   3,154,000   3,154,000    
Cash acquired   800,000            
Contingent cash obligation/payment   1,000,000            
Additional cash payments   200,000            
Fair value of contingent cash payment   $ 200,000            
Deferred tax assets, net       0   0    
AssetEye, Inc. | Developed product technologies                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets   5 years            
Intangible assets acquired       1,638,000   1,638,000    
AssetEye, Inc. | Trade names                
Business Acquisition [Line Items]                
Intangible assets acquired       6,000   6,000    
AssetEye, Inc. | Client relationships                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets   10 years            
Intangible assets acquired       1,041,000   1,041,000    
2016 Acquisitions                
Business Acquisition [Line Items]                
Contingent cash obligation/payment       300,000   300,000    
Deferred cash obligation       7,300,000 8,700,000 7,300,000    
Deferred cash obligation discount       (2,200,000) (1,200,000) (2,200,000)    
Gain (loss) recognized due to change in fair value of cash consideration       500,000   300,000 (100,000)  
Payments of contingent cash obligations           1,300,000 0  
Payments due to certain employees and former shareholders           100,000 3,300,000  
Recurring                
Business Acquisition [Line Items]                
Liabilities measured at fair value       598,000 541,000 598,000    
Contingent Consideration | Recurring | AssetEye, Inc.                
Business Acquisition [Line Items]                
Liabilities measured at fair value       255,000 539,000 255,000    
Level 3 | Recurring                
Business Acquisition [Line Items]                
Liabilities measured at fair value       598,000 541,000 598,000    
Level 3 | Contingent Consideration                
Business Acquisition [Line Items]                
Liabilities measured at fair value       598,000 541,000 598,000 $ 394,000 $ 841,000
Level 3 | Contingent Consideration | Recurring | AssetEye, Inc.                
Business Acquisition [Line Items]                
Liabilities measured at fair value       $ 255,000 539,000 $ 255,000    
Deferred Tax Asset | NWP                
Business Acquisition [Line Items]                
Adjustment, deferred tax assets         $ 1,000,000