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Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 13, 2016
Mar. 31, 2016
Dec. 31, 2015
Office of Foreign Assets Control [Member]      
Loss Contingencies [Line Items]      
Transaction period under review 5 years    
Potential monetary penalties accrued     $ 900
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