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Mandatorily Redeemable Series A Preferred Stock - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Feb. 10, 2017 | Jan. 31, 2012 | Sep. 30, 2011 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Nov. 09, 2016
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | 40,474,085 |  |  |  | 40,474,085 |  | 40,474,085 |  | 38,884,068 |
Proceeds from issuance of common stock | $ 0 | $ 0 |  |  |  |  |  |  |  |
Interest expense incurred |  |  |  |  |  |  |  | $ 4,936,000 |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Redeemable Series A preferred stock |  |  |  |  |  |  |  |  |  | $ 40,329,000
Mandatorily Redeemable Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate per annum |  |  |  |  |  |  | 15.00% |  |  |
Preferred shares issued for dividends |  |  |  |  |  |  | 0 | 4,148,000 |  |
Interest expense incurred |  |  |  |  | $ 0 | $ 1,813,000 | $ 0 | $ 4,936,000 |  |
Interest expense capitalized to property, plant and equipment |  |  |  |  |  |  | $ 0 |  | $ 59,000 |
Mandatorily Redeemable Series A Preferred Stock | Installment One |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Payment Terms |  |  |  |  |  |  | Dividends accrued and accumulated on the Series A Preferred Stock, whether or not earned or declared, at the rate of 15% per annum and compound quarterly on April 1, July 1, October 1 and January 1. |  |  |
Series A Investor |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Date of agreement |  |  |  |  |  |  | Sep. 13, 2011 |  |  |
Series A Investor | Tranche One |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  | 14,300,000 |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 22,000,000 |  |  |  |  |  |
Series A Investor | Mandatorily Redeemable Series A Preferred Stock | Tranche One |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  | 22,000 |  |  |  |  |  |
Preferred stock issued, value per share |  |  |  | $ 1,000 |  |  |  |  |  |
Series A Investor | Mandatorily Redeemable Series A Preferred Stock | Tranche Two |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  | 26,000 |  |  |  |  |  |  |
Proceeds from issuance of redeemable preferred stock |  |  | $ 26,000,000 |  |  |  |  |  |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Specific information regarding dividend payment dates or timing and whether or not dividends are paid on a cumulative basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21564-112644 + Details
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