Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
May 31, 2016 |
May 31, 2015 |
|
| Receivables [Abstract] | ||
| Balance at beginning of period | $ 2,041 | $ 2,158 |
| Bad debt expense (recovery) | (19) | 207 |
| Recoveries | 21 | 10 |
| Accounts written off | (256) | (118) |
| Balance at end of period | $ 1,787 | $ 2,257 |