Quarterly report pursuant to Section 13 or 15(d)

Net Capital Requirements - Additional Information (Details)

v3.3.0.814
Net Capital Requirements - Additional Information (Details)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Net Capital Requirements [Line Items]    
Stockholder's equity $ 385,068,000 $ 336,471,000
Securities America    
Net Capital Requirements [Line Items]    
Regulatory net capital 5,508,000  
Securities America | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement 250,000  
Triad    
Net Capital Requirements [Line Items]    
Regulatory net capital 7,892,000  
Triad | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement 250,000  
Investacorp Inc    
Net Capital Requirements [Line Items]    
Regulatory net capital 4,905,000  
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 6,010,000  
KMS Financial Services, Inc. (KMS) | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement 250,000  
Ladenburg    
Net Capital Requirements [Line Items]    
Regulatory net capital 23,575,000  
Ladenburg | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement 250,000  
Securities Service Network, Inc. (SSN)    
Net Capital Requirements [Line Items]    
Regulatory net capital 5,697,000  
Alternative excess amount over net capital requirement $ 5,320,000  
Indebtedness to net capital 1.01  
Securities Service Network, Inc. (SSN) | Minimum    
Net Capital Requirements [Line Items]    
Alternative minimum net capital requirement $ 377,000  
Premier | Regulatory requirements    
Net Capital Requirements [Line Items]    
Stockholder's equity 1,459,000  
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