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Collateralized Transactions - Narrative (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) broker-dealer	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Bank call loans	$ 148,300,000		$ 100,200,000
Customer securities under customer margin loans available to be pledged	1,100,000,000
Customer securities under customer margin loans agreement available to be repledged	114,700,000
Customer securities deposited to secure obligations and margin requirements under option contracts	360,700,000
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty	705,800,000		546,300,000
Carrying value of securities owned by the Company loaned or pledged	$ 163,700,000		142,700,000
Receivable from brokers and clearing organizations, number of major broker-dealers | broker-dealer	4
Receivable from brokers and clearing organizations	$ 124,800,000
Nonrecurring [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warehouse Agreement Borrowings	$ 11,845,000		54,300,000
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Settlement with Financial Institution, Period to Complete Transactions	1 day
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Settlement with Financial Institution, Period to Complete Transactions	3 days
Credit Concentration Risk [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed mortgages for a period	15 days
Variable interest rate under warehouse facility	one month LIBOR
Interest expense	$ 200,000	$ 125,000
Securities Borrowed Transactions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer securities under customer margin loans agreement available to be repledged	23,400,000		36,000,000
Securities received as collateral under securities borrowed transaction with market value	185,900,000		217,000,000
Reverse Repurchase Agreements [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Customer securities under customer margin loans agreement available to be repledged	320,800,000		278,800,000
Securities received as collateral under securities borrowed transaction with market value	320,800,000		$ 278,800,000
Corporate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized loans, collateralized by firm	163,500,000
Other Than Corporate Customer [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateralized loans, collateralized by customer securities	$ 230,600,000

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Pledged securities owned and pledged as collateral amount eligible to be repledged by counterparty carrying value.

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Securities owned and pledged as collateral amount not eligible to be repledged by counterparty carrying value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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