Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Intangible Assets Subject To Amortization (Details)

v3.7.0.1
Intangible Assets - Intangible Assets Subject To Amortization (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 8 years 9 months 80 days  
Gross Carrying Amount $ 217,550 $ 217,550
Accumulated Amortization $ 103,499 92,612
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 $ 17,387 15,754
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 $ 45,255 40,505
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 $ 6,421 6,421
Accumulated Amortization $ 5,343 4,638
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 $ 2,023 1,971
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 $ 11,131 10,017
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 $ 15,109 12,481
Relationship 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 $ 124 119
Other    
Indefinite-lived Intangible Assets [Line Items]    
Weighted-Average Estimated Useful Life (years) 6 years  
Gross Carrying Amount $ 67 67
Accumulated Amortization $ 67 $ 67