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Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2011	May 31, 2011 PrinceRidge [Member]	Dec. 31, 2012 PrinceRidge [Member]	Dec. 31, 2011 PrinceRidge [Member]	May 31, 2011 Total Estimated Fair Value as of Acquisition Date (provisional) [Member]	May 31, 2011 Total Estimated Fair Value as of Acquisition Date (provisional) [Member] PrinceRidge [Member]	May 31, 2011 Measurement Period Adjustments [Member]	May 31, 2011 Measurement Period Adjustments [Member] PrinceRidge [Member]	May 31, 2011 Estimated Fair Value as of Acquisition Date (final) [Member]	May 31, 2011 Estimated Fair Value as of Acquisition Date (final) [Member] PrinceRidge [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Broker-dealer license purchase accounting adjustment		$ 166
Adjustment in fair value of assets	(30)
Net Fair Value of IFMI Contribution			45,000				45,000				45,000
Fair value of net assets acquired				17,344			17,344	17,344			17,344	17,344
Net Fair Value of PrinceRidge, Total							62,344				62,344
Effective Ownership Percentage, IFMI			70.00%		98.00%	70.00%	70.30%		0.02%		70.50%
Effective Ownership Percentage, Non-Controlling Interest			30.00%		2.00%	30.00%	29.70%		(0.02%)		29.50%
Effective Ownership Percentage, Total							100.00%				100.00%
Allocable Net Fair Value of PrinceRidge, IFMI							43,842		93		43,935
Allocable Net Fair Value of PrinceRidge, Non-Controlling Interest (purchase price)				18,409			18,502	18,502	(93)	(93)	18,409	18,409
Excess of purchase price over net fair value				1,065				1,158		(93)		1,065
Broker-dealer license purchase accounting adjustment				166
Goodwill (4)(5)					$ 899	$ 992		$ 992		$ (93)		$ 899

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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