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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Disposal group including discontinued operation interest and other income expense.

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Disposal group including discontinued operation restricted cash.

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Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year.

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Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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For the disposal group, including a component of the entity (discontinued operation), carrying value of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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For the disposal group, including a component of the entity (discontinued operation), carrying value of obligations incurred and payable pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include interest, rent, salaries, and utilities.

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Amount of interest expense allocated to disposal group, including a discontinued operation.

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Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of prepaid and other assets attributable to disposal group.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Liability (such as a mortgage) related to a disposal group that is held for sale and anticipated to be sold in less than one year. The liability is expected to be discharged as part of the plan of sale for the asset.

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