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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 |  |  |

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