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Mandatorily Redeemable Series A Preferred Stock - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2012
USD ($)
shares
Sep. 30, 2011
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Director
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Nov. 09, 2016
USD ($)
Jul. 01, 2013
shares
Sep. 13, 2011
shares
Class Of Stock [Line Items]                
Common stock, shares issued | shares     38,884,068 22,139,480        
Interest expense incurred     $ 5,565 $ 5,078 $ 5,601      
Transaction costs incurred in connection with the issuance of the preferred shares     $ 11,047          
Series A Preferred Stock                
Class Of Stock [Line Items]                
Redeemable Series A preferred stock           $ 40,329    
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.          
Number of directors entitled to be elected | Director     4          
Number of directors | Director     7          
Preferred stock, dividend rate per annum     15.00%          
Preferred shares issued for dividends | shares     4,776 4,865 4,218      
Interest expense incurred     $ 5,624 $ 5,652 $ 5,965      
Interest expense capitalized to property, plant and equipment     $ 59 $ 574 $ 364      
Mandatorily redeemable preferred shares date     Sep. 13, 2016          
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.          
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          
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          
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 | shares   14,300,000            
Proceeds from issuance of common stock   $ 22,000            
Series A Investor | Mandatorily Redeemable Series A Preferred Stock | Tranche One                
Class Of Stock [Line Items]                
Preferred stock, shares issued | shares   22,000            
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              
Proceeds from issuance of redeemable preferred stock $ 26,000