Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Intangible Assets Subject To Amortization (Details)

v3.8.0.1
Intangible Assets - Intangible Assets Subject To Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 10 years 1 month 3 days  
Gross Carrying Amount $ 166,889 $ 208,270
Accumulated Amortization $ 90,758 104,659
Technology    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 7 years 10 months 24 days  
Gross Carrying Amount $ 25,563 25,563
Accumulated Amortization $ 19,837 19,020
Relationships with financial advisors    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 14 years 8 months 12 days  
Gross Carrying Amount $ 117,995 117,995
Accumulated Amortization $ 52,261 49,925
Covenants not-to-compete    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 3 years 10 months 24 days  
Gross Carrying Amount $ 6,421 6,421
Accumulated Amortization $ 5,858 5,732
Trade names    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 7 years 8 months 12 days  
Gross Carrying Amount $ 16,910 16,910
Accumulated Amortization $ 12,802 12,245
Renewal revenue    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 7 years 10 months 24 days  
Gross Carrying Amount $ 0 41,381
Accumulated Amortization $ 0 $ 17,737