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Acquisition and Transition Costs, Intangible Asset Amortization and Special Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Business Acquisition [Line Items]
Acquisition and Transition Costs	$ 0	$ 75	$ 58	$ 148
Special Charges	0	662	0	662
Investment Banking [Member]
Business Acquisition [Line Items]
Finite lived intangible assets, amortization expenses	204	594	408	3,043
Special Charges	0	662	0	662
Investment Management [Member]
Business Acquisition [Line Items]
Finite lived intangible assets, amortization expenses	$ 1,851	$ 1,674	$ 3,641	$ 3,349

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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