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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) |  |  |  |  |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Canada [Member] | Dec. 31, 2012 Canada [Member] | Sep. 30, 2013 United States [Member] | Dec. 31, 2012 United States [Member] | Sep. 30, 2013 BLACKIRON Data [Member] | Sep. 30, 2013 North America Telecom [Member] | Jul. 31, 2013 North America Telecom [Member] | Jul. 31, 2013 North America Telecom [Member] Canada [Member] | Sep. 30, 2013 Primus Telecommunications Inc [Member] | Jul. 31, 2013 Primus Telecommunications Inc [Member] United States [Member]
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 60,744,000 |  | $ 34,162,000 |  | $ 26,582,000 | $ 20,200,000 |  | $ 22,600,000 |  | $ 3,700,000 |
Goodwill attributable to reporting unit | 4,014,000 |  |  |  | 4,014,000 |  |  |  |  | 13,200,000 |  | 4,000,000
Sale of Trademark |  |  |  |  |  |  |  | 27,000,000 |  |  |  |
Deferred tax liabilities |  |  |  |  |  |  |  | $ 10,500,000 |  |  |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from intangible assets other than goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition For the disposal group, including a component of the entity (discontinued operation), carrying amount of goodwill (adjusted for any amortization recognized prior to adoption of FAS 142 and impairment charges). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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