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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
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