Geographic Information for Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	$ 61,669		$ 70,651
United States
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	59,716		69,010
International
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	$ 1,953	[1]	$ 1,641	[1]

[1] The net property and equipment of the individual countries comprising these amounts are not significant.