Earnings Per Share - Out of Money Stock Options Excluded from Computation of Diluted EPS (Parenthetical) (Detail) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Exercise price of stock option excluded from computation of diluted EPS	$ 6.26	$ 6.26	$ 6.26	$ 6.26

Stock option excluded from computation of diluted earning per share exercise price.

No definition available.

Name:	vifl_StockOptionExcludedFromComputationOfDilutedEarningPerShareExercisePrice
Namespace Prefix:	vifl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration