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Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Percent of credit loss	2.80%vicr_PercentageOfCreditLoss
Rate of return required	5.00%vicr_RateOfReturnRequired
Estimated timeframe for auctions of securities minimum	3 years
Estimated timeframe for auctions of securities maximum	5 years
Percentage of liquidity risk premium	5.00%vicr_PercentageOfLiquidityRiskPremium
Increase or decrease in the liquidity risk premium	1.00%vicr_IncreaseOrDecreaseInLiquidityRiskPremium
Increase or decrease, respectively, the fair value of the Failed Auction Securities	$ 100,000vicr_IncreaseOrDecreaseFairValueOfFailedAuctionSecurities

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