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Stock Option Plan and Stock Grants - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended
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May 31, 2013 | Apr. 30, 2013 | Mar. 31, 2013 | Jan. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | May 31, 2013 Restricted Stock [Member] Director [Member] | Mar. 31, 2013 Restricted Stock [Member] Director [Member] | Jan. 31, 2013 Restricted Stock [Member] Director [Member] | May 31, 2013 Restricted Stock [Member] Director [Member] Phase one | Mar. 31, 2013 Restricted Stock [Member] Director [Member] Phase one | Jan. 31, 2013 Restricted Stock [Member] Director [Member] Phase one | May 31, 2013 Restricted Stock [Member] Director [Member] Phase two | Mar. 31, 2013 Restricted Stock [Member] Director [Member] Phase two | Jan. 31, 2013 Restricted Stock [Member] Director [Member] Phase two | May 31, 2013 Restricted Stock [Member] Director [Member] Phase three | Mar. 31, 2013 Restricted Stock [Member] Director [Member] Phase three | Jan. 31, 2013 Restricted Stock [Member] Director [Member] Phase three | Apr. 30, 2013 Restricted Stock [Member] Senior Management | Feb. 28, 2013 Restricted Stock [Member] Senior Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of stock-related compensation |  |  |  |  | $ 1,600,000 | $ 1,200,000 | $ 4,332,000 | $ 4,465,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation, grants awarded |  |  |  |  |  |  |  |  | 40,000 | 666 | 62,000 |  |  |  |  |  |  |  |  |  | 2,000 | 68,666
Share based compensation, fair market value |  |  |  |  |  |  |  |  | $ 1,700,000 | $ 0 | $ 2,200,000 |  |  |  |  |  |  |  |  |  | $ 80,200 | $ 2,500,000
Share based compensation, vesting description | One-third of the shares of restricted common stock covered by these awards vest on each of November 8, 2013, May 8, 2014, and May 8, 2015 | These Restricted Stock Grants will vest on December 31, 2013. | One-third of the shares of restricted common stock covered by these awards vests on each of September 13, 2013, March 13, 2014, and March 13, 2015. | These Restricted Stock Grants will vest on December 31, 2013.One-third of the shares of restricted common stock covered by these awards vest on each of December 31, 2013, December 31, 2014, and December 31, 2015. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation, restricted stock, vesting date |  |  |  |  |  |  |  |  |  |  |  | Nov. 08, 2013 | Sep. 13, 2013 | Dec. 31, 2013 | May 08, 2014 | Mar. 13, 2014 | Dec. 31, 2014 | May 08, 2015 | Mar. 13, 2015 | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2013

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- Definition Description of the period of time over which a director's right to exercise an award is no longer contingent on the passage of time, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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- Definition The total fair value of shares issued during the period under a deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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