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Discontinued Operations - Summarized Operating Results of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Income Statement by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net revenue | $ 78,866 | $ 134,960 | $ 307,475 | $ 552,319 |
Operating expenses | 78,557 | 132,058 | 299,122 | 543,630 |
Income (loss) from operations | 309 | 2,902 | 8,353 | 8,689 |
Interest expense | (2,851) | (6,381) | (11,365) | (20,779) |
Gain (loss) on early extinguishment or restructuring of debt | (21,178) | (21,083) | (21,178) | (21,083) |
Interest income and other income (expense) | (153) | (38) | (212) | 309 |
Foreign currency transaction gain (loss) | (345) | 291 | (1,317) | (2,467) |
Income (loss) before income tax | (24,218) | (24,309) | (25,719) | (35,331) |
Income tax (expense) benefit | 474 | 181 | 176 | (4,976) |
Income (loss) from discontinued operations | (23,744) | (24,128) | (25,543) | (40,307) |
Summarized assets and liabilities classified as held for sale |  |  |  |  |
Assets held for sale | 53,478 |  | 53,478 |  | 40,066
Liabilities held for sale | 31,729 |  | 31,729 |  | 24,304
International Carrier Services [Member] |  |  |  |  |
Summarized assets and liabilities classified as held for sale |  |  |  |  |
Accounts receivable | 20,515 |  | 20,515 |  | 16,070
Prepaid expenses and other current assets | 3,964 |  | 3,964 |  | 4,196
Restricted cash | 50 |  | 50 |  | 487
Long-lived assets | 20,292 |  | 20,292 |  | 19,313
Assets held for sale | 44,821 |  | 44,821 |  | 40,066
Accounts payable | 6,858 |  | 6,858 |  | 10,580
Accrued interconnection costs | 14,121 |  | 14,121 |  | 6,961
Accrued expenses and other liabilities | 5,093 |  | 5,093 |  | 6,763
Liabilities held for sale | 26,072 |  | 26,072 |  | 24,304
North America Telecom [Member] |  |  |  |  |
Summarized assets and liabilities classified as held for sale |  |  |  |  |
Accounts receivable | 949 |  | 949 |  |
Prepaid expenses and other current assets | 1,020 |  | 1,020 |  |
Restricted cash |  |  |  |  |
Long-lived assets | 6,688 |  | 6,688 |  |
Assets held for sale | 8,657 |  | 8,657 |  |
Accounts payable | 1,053 |  | 1,053 |  |
Accrued interconnection costs | 915 |  | 915 |  |
Accrued expenses and other liabilities | 3,689 |  | 3,689 |  |
Liabilities held for sale | $ 5,657 |  | $ 5,657 |  |

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- Definition Amount of interest expense allocated to disposal group, including a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26872618&loc=d3e7436-122677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1063-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1060-107759 + Details
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