Total Assets by Segment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Assets	$ 356,710	$ 293,142
Data Center Services
Segment Reporting Information [Line Items]
Assets	215,004	116,953
IP Services
Segment Reporting Information [Line Items]
Assets	$ 141,706	$ 176,189