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Transactions with Related Parties - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
Aug. 14, 2008
Related Party Transaction [Line Items]          
Unsecured note issued to acquire Privileged Access         $ 2.0
Property leased by Privileged Access, lease term       12 years  
Number of properties leased by Privileged Access         82
Acquisition of Privileged Access, Cash deposited into an escrow account for liabilities retained         4.8
Amount of cash from escrow fund to be distributed to Privileged Access     0.1    
Proceeds from the escrow account     1.1    
Balance in Escrow account   0.2      
Lease payments 0.9 1.0 0.5    
Office space lease, effective rent payment period     7 months    
Office space lease, free rent period     5 months    
Percentage of ownership interests in Previleged Access 91.80% 90.90%      
Description Of Employment Agreement     The Company entered into an employment agreement effective as of January 1, 2008 (the “Employment Agreement”) with Mr. McAdams which provided for an initial term of three years which expired on December 31, 2010.    
Consulting agreement expiry date     Dec. 31, 2010    
Employment agreement, initial term     3 years    
Description Of Performance Based Bonus Calculation     The Employment Agreement provided for a minimum annual base salary of $0.3 million, with the option to receive an annual bonus in an amount up to three times his base salary.    
Annual Salary to owner of Privileged Access     0.3    
Lease agreement, term
The leases entered into between the customer and the Company for the rental of a site are generally month-to-month or for a period of one to ten years, renewable upon the consent of the parties or, in some instances, as provided by statute.
        
Mr. McAdams, President
          
Related Party Transaction [Line Items]          
Percentage of ownership interests in Previleged Access     100.00%    
Chief Executive Officer [Member]
          
Related Party Transaction [Line Items]          
Related Party Transaction, Due from (to) Related Party $ 0.3