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Mandatorily Redeemable Series A Preferred Stock - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Jan. 31, 2012 USD ($) shares | Sep. 30, 2011 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) shares | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Director shares | Sep. 30, 2015 USD ($) shares | Dec. 31, 2015 USD ($) Director shares | Dec. 31, 2014 USD ($) shares | Nov. 09, 2016 USD ($) | Mar. 28, 2014 USD ($) | Jul. 01, 2013 shares | Sep. 13, 2011 shares
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  | 22,229,570 |  | 22,229,570 |  | 22,139,480 | 22,039,600 |  |  |  |
Interest expense incurred |  |  |  |  | $ 4,936,000 | $ 3,690,000 | $ 5,078,000 | $ 5,601,000 |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Series A preferred stock |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |
Preferred stock, liquidation value |  |  | $ 39,700,000 |  | $ 39,700,000 |  | $ 35,552,000 | $ 30,687,000 |  |  |  |
Series A Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
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, shares authorized | shares |  |  |  |  |  |  |  |  |  |  | 100,000 | 200,000
Preferred stock, voting rights description |  |  |  |  | The holders of the shares of Series A Preferred Stock were not entitled to vote, but were entitled to elect four of the seven directors to the Board. |  | The holders of the Preferred Shares are not entitled to vote, but are entitled to elect four of the seven directors on the Board. |  |  |  |  |
Number of directors entitled to be elected | Director |  |  |  |  | 4 |  | 4 |  |  |  |  |
Number of directors | Director |  |  |  |  | 7 |  | 7 |  |  |  |  |
Preferred stock, dividend rate per annum |  |  |  |  | 15.00% |  | 15.00% |  |  |  |  |
Preferred shares issued for dividends | shares |  |  |  |  | 4,148 | 3,581 | 4,865 | 4,218 |  |  |  |
Interest expense incurred |  |  | $ 1,813,000 | $ 1,256,000 | $ 4,936,000 | $ 3,690,000 | $ 5,652,000 | $ 5,965,000 |  |  |  |
Interest expense capitalized to property, plant and equipment |  |  |  |  | $ 59,000 | $ 463,000 | 574,000 | $ 364,000 |  |  |  |
Mandatorily redeemable preferred shares date |  |  |  |  | Sep. 13, 2016 |  |  |  |  |  |  |
Mandatorily Redeemable Series A Preferred Stock | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Options to repay of preferred shares amount |  |  |  |  | $ 1,000,000 |  | 1,000,000 |  |  |  |  |
Redeemable Series A preferred stock |  |  |  |  |  |  | 12,500,000 |  |  |  |  |
Mandatorily Redeemable Series A Preferred Stock | Tranche One |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs incurred in connection with the issuance of the preferred shares |  |  |  |  | 1,698,000 |  | 1,698,000 |  |  |  |  |
Mandatorily Redeemable Series A Preferred Stock | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs incurred in connection with the issuance of the preferred shares |  |  |  |  | $ 1,639,000 |  | $ 1,639,000 |  |  |  |  |
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. |  | Dividends accrue and accumulate on the Preferred Shares, 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 |  | Sep. 13, 2011 |  |  |  |  |
Series A Investor | Tranche One |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  | 14,300,000,000 |  |  |  |  |  |  |  |  |  |
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 | shares |  | 22,000,000 |  |  |  |  |  |  |  |  |  |
Preferred stock issued, value per share | $ / shares |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Series A Investor | Mandatorily Redeemable Series A Preferred Stock | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | shares | 26,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of redeemable preferred stock | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |

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