Quarterly report pursuant to Section 13 or 15(d)

Net Capital Requirements - Additional Information (Details)

v3.2.0.727
Net Capital Requirements - Additional Information (Details)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Net Capital Requirements [Line Items]    
Stockholder's equity $ 397,479,000 $ 336,471,000
Securities America    
Net Capital Requirements [Line Items]    
Regulatory net capital 8,281,000  
Securities America | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement 250,000  
Ladenburg    
Net Capital Requirements [Line Items]    
Regulatory net capital 18,888,000  
Ladenburg | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement 267,000  
Triad    
Net Capital Requirements [Line Items]    
Regulatory net capital 8,198,000  
Triad | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement 250,000  
Investacorp Inc    
Net Capital Requirements [Line Items]    
Regulatory net capital 5,461,000  
Investacorp Inc | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement 250,000  
KMS Financial Services, Inc. (KMS)    
Net Capital Requirements [Line Items]    
Regulatory net capital 5,912,000  
Securities Service Network, Inc. (SSN)    
Net Capital Requirements [Line Items]    
Regulatory net capital 5,071,000  
Alternative excess amount over net capital requirement $ 4,696,000  
Indebtedness to net capital 1.1  
Securities Service Network, Inc. (SSN) | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement $ 375,000  
Premier | Regulatory requirements    
Net Capital Requirements [Line Items]    
Stockholder's equity 1,403,000  
Premier | Minimum | Cash    
Net Capital Requirements [Line Items]    
Stockholder's equity 250,000  
Premier | Minimum | Regulatory requirements    
Net Capital Requirements [Line Items]    
Stockholder's equity 1,000,000  
Premier | Minimum | Regulatory requirements | Cash    
Net Capital Requirements [Line Items]    
Stockholder's equity $ 250,000