Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Intangible Assets Subject To Amortization (Details)

v3.4.0.3
Intangible Assets - Intangible Assets Subject To Amortization (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 9 years 6 months 26 days  
Gross Carrying Amount $ 209,840 $ 209,840
Accumulated Amortization $ 77,054 71,909
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 $ 13,305 12,488
Relationships with financial advisors    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 15 years 2 months 12 days  
Gross Carrying Amount $ 110,671 110,671
Accumulated Amortization $ 34,136 32,028
Vendor relationships    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 7 years  
Gross Carrying Amount $ 3,613 3,613
Accumulated Amortization $ 3,613 3,613
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 $ 6,035 6,035
Accumulated Amortization $ 3,667 3,347
Customer accounts    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 8 years 3 months 18 days  
Gross Carrying Amount $ 2,029 2,029
Accumulated Amortization $ 1,827 1,765
Trade name    
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 $ 8,347 7,790
Renewal revenue    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 7 years 10 months 24 days  
Gross Carrying Amount $ 41,381 41,381
Accumulated Amortization $ 8,540 7,263
Relationships with investment banking clients    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 4 years  
Gross Carrying Amount $ 2,586 2,586
Accumulated Amortization $ 2,586 2,586
Leases    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 6 years  
Gross Carrying Amount $ 861 861
Accumulated Amortization $ 861 861
Referral agreement    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 6 years 7 months 6 days  
Gross Carrying Amount $ 124 124
Accumulated Amortization $ 105 101
Other    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 6 years  
Gross Carrying Amount $ 67 67
Accumulated Amortization $ 67 $ 67