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Accounts Receivable and Allowance for Doubtful Receivables - Allowance for Doubtful Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
Receivables [Abstract]        
Balance at beginning of period $ 3,584us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,748us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,672us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,952us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Bad debt expense 494us-gaap_ProvisionForDoubtfulAccounts 618us-gaap_ProvisionForDoubtfulAccounts 725us-gaap_ProvisionForDoubtfulAccounts 2,816us-gaap_ProvisionForDoubtfulAccounts
Recoveries 10us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 9us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 29us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries 28us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Accounts written off (113)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (484)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (451)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (2,905)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of period $ 3,975us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,891us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,975us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,891us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent