Business and Significant Accounting Policies (Detail) - Property, Equipment and Leasehold Improvements, Less Accumulated Depreciation and Amortization (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Property, Equipment and Leasehold Improvements	$ 229,420	$ 229,334
Less — accumulated depreciation and amortization	(140,331)	(161,202)
	89,089	68,132
Software [Member]
Useful Life, Minimum	2
Useful Life, Maximum	7
Property, Equipment and Leasehold Improvements	135,167	130,733
Equipment And Furniture [Member]
Useful Life, Minimum	3
Useful Life, Maximum	8
Property, Equipment and Leasehold Improvements	29,907	34,828
Leasehold Improvements [Member]
Useful Life, Minimum	2
Useful Life, Maximum	15
Property, Equipment and Leasehold Improvements	$ 64,346	$ 63,773

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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