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 6 Months Ended
Jun. 30, 2016
May 31, 2016
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]            
Goodwill $ 261,768,000     $ 261,768,000 $ 261,768,000 $ 220,097,000
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     1,500,000 1,500,000  
Goodwill 3,216,000     3,216,000 3,216,000  
Intangible assets acquired 3,585,000     3,585,000 3,585,000  
Deferred tax assets, net $ 0     0 0  
eSupply, Systems, LLC | Developed product technologies            
Business Acquisition [Line Items]            
Amortized useful life of acquired intangible assets 3 years          
eSupply, Systems, LLC | Client relationships            
Business Acquisition [Line Items]            
Amortized useful life of acquired intangible assets 10 years          
AssetEye, Inc.            
Business Acquisition [Line Items]            
Total purchase price   $ 4,900,000        
Cash portion of purchase price   3,600,000        
Cash acquired   800,000        
Deferred cash payment amount related to acquisition   $ 1,000,000        
Length of time for acquisition deferred cash payment to be made   2 years        
Contingent cash obligation/payment   $ 1,000,000        
Additional Cash Payments   200,000        
Fair value of deferred cash payment   900,000        
Fair value of contingent cash payment   200,000        
Goodwill   3,154,000        
Intangible assets acquired   2,685,000        
Deferred tax assets, net   $ 0        
AssetEye, Inc. | Trade names            
Business Acquisition [Line Items]            
Amortized useful life of acquired intangible assets   5 years        
AssetEye, Inc. | Client relationships            
Business Acquisition [Line Items]            
Amortized useful life of acquired intangible assets   10 years        
NWP            
Business Acquisition [Line Items]            
Total purchase price     $ 69,000,000      
Cash portion of purchase price     59,000,000      
Cash acquired     100,000      
Deferred cash payment amount related to acquisition     $ 7,200,000      
Length of time for acquisition deferred cash payment to be made     3 years      
Other payments     $ 3,200,000      
Fair value of deferred cash payment     6,800,000      
Acquisition costs     300,000      
Goodwill     35,292,000      
Payments due to certain employees and former shareholders         3,200,000  
Intangible assets acquired     16,349,000      
Goodwill carryover tax base     700,000      
Intangible assets acquired carryover tax base     11,000,000      
Deferred tax assets, net     10,154,000      
Gross contractual amount of acquired receivables     11,300,000      
Estimated uncollectable amount of acquired receivables     3,400,000      
Indemnification asset recorded     1,200,000      
Settlement liability     500,000      
NWP | Federal and State Jurisdictions [Member]            
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      
NWP | Trade names            
Business Acquisition [Line Items]            
Amortized useful life of acquired intangible assets     3 years      
NWP | Client relationships            
Business Acquisition [Line Items]            
Amortized useful life of acquired intangible assets     10 years      
2016 Acquisitions            
Business Acquisition [Line Items]            
Deferred cash payment amount related to acquisition         9,600,000  
Deferred cash obligation discount $ 500,000     500,000 500,000  
Contingent cash obligation/payment $ 200,000     200,000 200,000  
Payments of contingent cash obligations       $ 0 $ 0