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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
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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 | $ 4,502 us-gaap_PaymentsOfDividendsCommonStock | $ 4,548 us-gaap_PaymentsOfDividendsCommonStock | $ 4,574 us-gaap_PaymentsOfDividendsCommonStock | $ 4,567 us-gaap_PaymentsOfDividendsCommonStock | $ 4,590 us-gaap_PaymentsOfDividendsCommonStock | $ 4,588 us-gaap_PaymentsOfDividendsCommonStock | $ 4,587 us-gaap_PaymentsOfDividendsCommonStock | $ 0 us-gaap_PaymentsOfDividendsCommonStock | $ 18,191 us-gaap_PaymentsOfDividendsCommonStock | $ 13,765 us-gaap_PaymentsOfDividendsCommonStock | $ 22,864 us-gaap_PaymentsOfDividendsCommonStock

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- 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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- Details
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