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Discontinued Operations - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jun. 30, 2012 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 M2 [Member] USD ($) | Jun. 30, 2013 BLACKIRON Data [Member] USD ($) | Sep. 30, 2013 BLACKIRON Data [Member] USD ($) | Sep. 30, 2013 BLACKIRON Data [Member] CAD | Apr. 17, 2013 BLACKIRON Data [Member] USD ($) | Apr. 17, 2013 BLACKIRON Data [Member] CAD | Jun. 30, 2012 Primus Australian [Member] USD ($) | May 31, 2012 Primus Australian [Member] USD ($) | May 31, 2012 Primus Australian [Member] AUD | Jul. 31, 2013 North America Telecom [Member] USD ($) | Sep. 30, 2013 North America Telecom [Member] USD ($) | Sep. 30, 2013 North America Telecom [Member] Working Capital Adjustment [Member] USD ($) | Sep. 30, 2013 North America Telecom [Member] Income Tax Related Liabilities [Member] USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding equity value |  |  |  |  |  |  |  |  |  |  | $ 195,600,000 | 200,000,000 |  | $ 195,700,000 | 192,400,000 |  |  |  |
Gain from sale of discontinued operations, net of tax | 15,650,000 |  |  | 150,695,000 | 98,666,000 |  |  | 135,000,000 |  |  |  |  | 98,600,000 |  |  |  | 15,600,000 |  |
Proceeds from sale placed in escrow |  |  |  |  |  |  |  |  | 19,500,000 | 20,000,000 |  |  | 9,800,000 |  |  |  | 15,250,000 |  |
Sale price of outstanding placed in escrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,000,000 |  |
Idemnification obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,900,000 |  |
Additional amount held in escrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Adjusted remaining carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |
Purchase consideration placed in escrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,450,000 | 4,000,000 | 4,800,000
Period of escrow to be released after closing date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 months |  | 30 days
Purchase agreement, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126,000,000 |  |  |
Amount released from escrow |  | 5,400,000 |  |  |  |  | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Net gain |  |  |  |  |  | 94,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Attributed adjustment to the long-lived assets of ICS |  |  | $ 10,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Adjustment, net of tax, to an amount previously reported in discontinued operations that is directly related to the disposal of the component in a prior period. Examples of circumstances leading to such adjustments include the resolution of contingencies relating to the terms of the disposal transaction or relating to the operations of the component prior to its disposal, and the settlement of certain employee benefit plan obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1020-107759 + Details
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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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