Geographical Information - Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	$ 381,283	$ 466,074
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	377,525	459,906
All other countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment, net	$ 3,758	$ 6,168