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Venezuela's Highly Inflationary Economy - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Feb. 28, 2013
Jan. 31, 2013
Feb. 28, 2013
Venezuela
Aug. 31, 2013
Venezuela
Investment in Country with High Inflationary Economy [Line Items]            
Percentage of consolidated revenues from small service location 1.00%          
Official published exchange rate     6.30 5.30    
Recognized losses related to the Venezuelan currency $ (390,000) $ (74,000)     $ (600,000)  
Net assets of Venezuelan subsidiary           2,900,000
Denominated receivables and cash of Venezuelan subsidiary           $ 1,700,000