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Stockholders' Equity - Summary of Shares Purchased by Employees Under the Stock Purchase Plan (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Aug. 31, 2013	Feb. 28, 2013	Aug. 31, 2012	Dec. 31, 2011	Jun. 30, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Purchased	27	26	23	50	51
Purchase Price	$ 23.42	$ 23.34	$ 24.88	$ 28.08	$ 28.02

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- Definition

Weighted average purchase price of capital shares purchased through an employee stock ownership plan.

+ References

No definition available.

+ Details

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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