Furniture, Equipment and Leasehold Improvements - Summary of Furniture, Equipment and Leasehold Improvements are Summarized (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Furniture, equipment and leasehold improvements, gross	$ 16,456	$ 13,139
Accumulated depreciation and amortization	(8,668)	(7,686)
Furniture, equipment and leasehold improvements, net	7,788	5,453
Furniture And Equipment [Member]
Property, Plant and Equipment [Line Items]
Furniture, equipment and leasehold improvements, gross	4,058	3,157
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Furniture, equipment and leasehold improvements, gross	5,533	4,906
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Furniture, equipment and leasehold improvements, gross	$ 6,865	$ 5,076

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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