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Quarterly Consolidated Financial Information (Unaudited) - Schedule of Unaudited Quarterly Financial Data of Company (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013
Quarterly Financial Information Disclosure [Abstract]
Dividend payment	$ 4,502us-gaap_PaymentsOfDividendsCommonStock	$ 4,548us-gaap_PaymentsOfDividendsCommonStock	$ 4,574us-gaap_PaymentsOfDividendsCommonStock	$ 4,567us-gaap_PaymentsOfDividendsCommonStock	$ 4,590us-gaap_PaymentsOfDividendsCommonStock	$ 4,588us-gaap_PaymentsOfDividendsCommonStock	$ 4,587us-gaap_PaymentsOfDividendsCommonStock	$ 0us-gaap_PaymentsOfDividendsCommonStock	$ 18,191us-gaap_PaymentsOfDividendsCommonStock	$ 13,765us-gaap_PaymentsOfDividendsCommonStock	$ 22,864us-gaap_PaymentsOfDividendsCommonStock

X

- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration