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Assets under Capital Leases Included in Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Capital Leased Assets [Line Items]
Equipment and furniture	$ 19,156	$ 17,032
Less accumulated depreciation and amortization	(35,559)	(33,372)
Property plant and equipment, net	7,583	6,611
Assets under capital leases
Capital Leased Assets [Line Items]
Equipment and furniture	392	392
Less accumulated depreciation and amortization	(318)	(257)
Property plant and equipment, net	$ 74	$ 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

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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