Impairment Charges by Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2009
Segment Reporting Information [Line Items]
Goodwill	$ 51,513
Other intangible assets	4,134
Goodwill and Intangible Asset Impairment, Total	55,647
Data Center Services
Segment Reporting Information [Line Items]
Goodwill	13,665
Goodwill and Intangible Asset Impairment, Total	13,665
IP Services
Segment Reporting Information [Line Items]
Goodwill	37,848
Other intangible assets	4,134
Goodwill and Intangible Asset Impairment, Total	$ 41,982