Stock Option Plan and Stock Based Compensation - Summary of Stock Options Outstanding (Detail) (USD $)	12 Months Ended
Feb. 28, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding, Options Outstanding	374,823
Weighted Average Remaining Contractual Life (in Years), Options Outstanding	5 years 8 months 12 days
Weight Average Exercise Price, Options Outstanding	$ 15.95
Number Exercisable, Options Exercisable	295,063
Weight Average Exercise Price, Options Exercisable	$ 16.16
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower range	$ 8.94
Exercise Prices, Upper range	$ 8.94
Number Outstanding, Options Outstanding	42,000
Weighted Average Remaining Contractual Life (in Years), Options Outstanding	4 years 2 months 12 days
Weight Average Exercise Price, Options Outstanding	$ 8.94
Number Exercisable, Options Exercisable	42,000
Weight Average Exercise Price, Options Exercisable	$ 8.94
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower range	$ 14.05
Exercise Prices, Upper range	$ 16.42
Number Outstanding, Options Outstanding	160,280
Weighted Average Remaining Contractual Life (in Years), Options Outstanding	6 years 10 months 24 days
Weight Average Exercise Price, Options Outstanding	$ 15.33
Number Exercisable, Options Exercisable	80,520
Weight Average Exercise Price, Options Exercisable	$ 15.50
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices, Lower range	$ 17.57
Exercise Prices, Upper range	$ 19.69
Number Outstanding, Options Outstanding	172,543
Weighted Average Remaining Contractual Life (in Years), Options Outstanding	5 years
Weight Average Exercise Price, Options Outstanding	$ 18.23
Number Exercisable, Options Exercisable	172,543
Weight Average Exercise Price, Options Exercisable	$ 18.23

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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