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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 13, 2016
Loss Contingencies [Line Items]        
Aggregate rent expense under operating leases $ 2,998,000 $ 3,061,000 $ 3,400,000  
Purchase obligations 17,766,000      
Indemnification liability $ 0      
Office of Foreign Assets Control [Member] | Subsequent Event [Member]        
Loss Contingencies [Line Items]        
Potential monetary penalties accrued       $ 900,000
Putative Class Action Complaint [Member]        
Loss Contingencies [Line Items]        
Loss contingency, Lawsuit filing date July 28, 2015      
Loss contingency, Name of defendants VASCO and certain of its current executive officers      
Derivative Complaint [Member]        
Loss Contingencies [Line Items]        
Loss contingency, Lawsuit filing date October 9, 2015      
Loss contingency, Name of defendants VASCO's Board of Directors and certain of its executive officers