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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 Regular Dividend | Oct. 31, 2013 Special Dividend | Nov. 19, 2013 Special Dividend Subsequent Event | Oct. 31, 2013 Restricted Stock Units (RSUs) | Oct. 31, 2012 Restricted Stock Units (RSUs) | Oct. 31, 2013 Restricted Stock Units (RSUs) Discontinued Operations | Oct. 31, 2012 Restricted Stock Units (RSUs) Discontinued Operations
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Total compensation expenses |  |  |  |  |  | $ 1,376 | $ 669 | $ 480 | $ 52
Dividends declared and paid per common share | $ 0.23 | $ 0.18 | $ 0.23 |  |  |  |  |  |
Dividends declared and paid | 12,253 |  | 12,253 |  |  |  |  |  |
Dividends declared per common share | $ 1.00 |  |  | $ 1.00 |  |  |  |  |
Cash dividends | $ 12,253 | $ 9,527 |  |  | $ 53,290 |  |  |  |
Common stock, dividend record date |  |  |  | Nov. 05, 2013 |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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