Operating Results for Business Segments, with Reconciliations from Segment Profit to Loss Before Income Taxes and Equity in (Earnings) of Equity-Method Investment (Detail) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Data center services	$ 34,114	$ 31,550	$ 98,137	$ 96,468
IP services	27,900	28,765	83,691	87,736
Total revenues	62,014	60,315	181,828	184,204
Direct costs of network, sales and services, exclusive of depreciation and amortization:
Data center services	20,480	20,405	58,743	63,232
IP services	10,307	11,162	31,643	33,683
Total direct costs of network, sales and services, exclusive of depreciation and amortization	30,787	31,567	90,386	96,915
Segment profit:
Data center services	13,634	11,145	39,394	33,236
IP services	17,593	17,603	52,048	54,053
Total segment profit	31,227	28,748	91,442	87,289
Restructuring	123		1,615	1,201
Other operating expenses, including direct costs of customer support, depreciation and amortization	31,529	29,284	92,811	87,223
Loss from operations	(425)	(536)	(2,984)	(1,135)
Non-operating expense	1,186	620	2,795	1,415
Loss before income taxes and equity in (earnings) of equity method investment	$ (1,611)	$ (1,156)	$ (5,779)	$ (2,550)