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Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 13, 2016
Mar. 31, 2017
Dec. 31, 2015
Putative Class Action Complaint [Member]      
Loss Contingencies [Line Items]      
Loss contingency, Lawsuit filing date   July 28, 2015  
Loss contingency, Name of defendants   Naming VASCO and certain of its current and former executive  
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 current and former executive officers  
Office of Foreign Assets Control [Member]      
Loss Contingencies [Line Items]      
Transaction period under review 5 years    
Potential monetary penalties accrued     $ 900