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Assets under Capital Leases Included in Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Capital Leased Assets [Line Items]
Equipment and furniture	$ 17,696	$ 17,032
Less accumulated depreciation and amortization	(34,026)	(33,372)
Property and equipment, net	6,699	6,611
Assets under capital lease
Capital Leased Assets [Line Items]
Equipment and furniture	392	392
Less accumulated depreciation and amortization	(278)	(257)
Property and equipment, net	$ 114	$ 135

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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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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