Quarterly report pursuant to Section 13 or 15(d)

Net Capital Requirements - Additional Information (Details)

Net Capital Requirements - Additional Information (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Net Capital Requirements [Line Items]
Stockholder's equity	$ 398,528,000us-gaap_StockholdersEquity	$ 336,471,000us-gaap_StockholdersEquity
Securities America
Net Capital Requirements [Line Items]
Regulatory net capital	4,383,000
Securities America \| Minimum
Net Capital Requirements [Line Items]
Alternative minimum net capital requirement	250,000
Ladenburg
Net Capital Requirements [Line Items]
Regulatory net capital	19,170,000
Ladenburg \| Minimum
Net Capital Requirements [Line Items]
Alternative minimum net capital requirement	267,000
Triad
Net Capital Requirements [Line Items]
Regulatory net capital	7,365,000
Triad \| Minimum
Net Capital Requirements [Line Items]
Alternative minimum net capital requirement	250,000
Investacorp Inc
Net Capital Requirements [Line Items]
Regulatory net capital	5,302,000
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	6,174,000
Securities Service Network, Inc. (SSN)
Net Capital Requirements [Line Items]
Regulatory net capital	2,825,000
Alternative excess amount over net capital requirement	2,479,000
Indebtedness to net capital	1.8
Securities Service Network, Inc. (SSN) \| Minimum
Net Capital Requirements [Line Items]
Alternative minimum net capital requirement	347,000
Premier \| Regulatory requirements
Net Capital Requirements [Line Items]
Stockholder's equity	1,323,000
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