Selected Segment Financial Data, Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Long-lived assets	$ 831,390	$ 309,312
Assets	1,250,886	664,642
Americas - United States
Segment Reporting Information [Line Items]
Long-lived assets	453,102	225,094
Assets	635,558	408,038
Americas - Other
Segment Reporting Information [Line Items]
Long-lived assets	11,712	4,051
Assets	26,580	26,664
EMEA
Segment Reporting Information [Line Items]
Long-lived assets	256,556	56,542
Assets	404,016	166,997
Asia /Pacific
Segment Reporting Information [Line Items]
Long-lived assets	110,020	23,625
Assets	$ 184,732	$ 62,943