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Discontinued Operations - Summarized Operating Results of Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net revenue $ 3,190 $ 50,316 $ 6,468 $ 111,199  
Operating expenses 3,113 46,070 6,342 100,327  
Income from operations 77 4,246 126 10,872  
Interest expense (3) (4,260) (3) (8,509)  
Interest income and other income (expense) (25) 28 (51) 46  
Foreign currency transaction loss   (262)   (339)  
Income (loss) before income tax 49 (248) 72 2,070  
Income tax (expense) (22) (359) (28) (298)  
Income from discontinued operations 27 (607) 44 1,772  
Liabilities held for sale 4,259   4,259   4,823
North America Telecom [Member]
          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Accounts receivable 311   311   670
Prepaid expenses and other current assets 550   550   839
Long-lived assets and other non-current assets 4,795   4,795   4,820
Assets held for sale 5,656   5,656   6,329
Accounts payable 618   618   869
Accrued interconnection costs 305   305   420
Accrued expenses and other liabilities 3,336   3,336   3,534
Liabilities held for sale $ 4,259   $ 4,259   $ 4,823