Quarterly report pursuant to Section 13 or 15(d)

Revenue (Major Customers) (Details)

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Revenue (Major Customers) (Details) - Revenue from contract with customer benchmark - Customer concentration risk - Fidelity
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Major Customers        
Revenue as a percentage of the company's total 15.00% 16.00% 15.00% 16.00%
Envestnet Wealth Solutions        
Major Customers        
Revenue as a percentage of the company's total 19.00% 21.00% 20.00% 21.00%