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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
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