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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Property - Property-Net (Detail) (USD $) In Thousands, unless otherwise specified											3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Buildings [Member]	Dec. 31, 2012 Buildings [Member]	Mar. 31, 2013 Leasehold improvements [Member]	Dec. 31, 2012 Leasehold improvements [Member]	Mar. 31, 2013 Furniture and equipment [Member]	Dec. 31, 2012 Furniture and equipment [Member]	Mar. 31, 2013 Construction in progress [Member]	Dec. 31, 2012 Construction in progress [Member]	Mar. 31, 2013 Minimum [Member] Leasehold improvements [Member]	Mar. 31, 2013 Minimum [Member] Furniture and equipment [Member]	Mar. 31, 2013 Maximum [Member] Buildings [Member]	Mar. 31, 2013 Maximum [Member] Leasehold improvements [Member]	Mar. 31, 2013 Maximum [Member] Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 466,146	$ 450,894	$ 161,639	$ 166,560	$ 153,477	$ 143,408	$ 131,921	$ 122,125	$ 19,109	$ 18,801
Less - accumulated depreciation and amortization	226,570	225,861
Property	$ 239,576	$ 225,033
Property, Plant and Equipment, Useful Life											3 years	3 years	33 years	20 years	10 years