Annual report pursuant to Section 13 and 15(d)

Net Capital Requirements (Details)

v3.8.0.1
Net Capital Requirements (Details) - USD ($)
$ in Thousands
Feb. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Jan. 31, 2016
Net Capital Requirements [Line Items]        
Stockholder's equity (at least)   $ 370,379 $ 362,474  
Securities America        
Net Capital Requirements [Line Items]        
Alternative minimum net capital requirement (at least)   250    
Regulatory net capital   8,628    
Triad        
Net Capital Requirements [Line Items]        
Alternative minimum net capital requirement (at least)   250    
Regulatory net capital   6,935    
Capital deficiency       $ 1,579
Payments for capital contribution $ 2,500      
Investacorp Inc        
Net Capital Requirements [Line Items]        
Alternative minimum net capital requirement (at least)   250    
Regulatory net capital   8,777    
KMS        
Net Capital Requirements [Line Items]        
Alternative minimum net capital requirement (at least)   250    
Regulatory net capital   6,470    
SSN        
Net Capital Requirements [Line Items]        
Regulatory net capital   6,604    
Ladenburg        
Net Capital Requirements [Line Items]        
Alternative minimum net capital requirement (at least)   250    
Regulatory net capital   24,265    
Premier        
Net Capital Requirements [Line Items]        
Stockholder's equity (at least)   2,312    
Premier | Minimum        
Net Capital Requirements [Line Items]        
Stockholder's equity (at least)   1,000    
Premier | Cash        
Net Capital Requirements [Line Items]        
Stockholder's equity (at least)   $ 250