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Redeemable Preferred Stocks - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Class Of Stock [Line Items]        
Fair value of the embedded derivative $ 1,521   $ 1,521 $ 1,642
Non-Operating Other Income [Member]        
Class Of Stock [Line Items]        
Unrealized loss on change in fair value of the embedded derivative 400 $ 1,100    
Other Noncurrent Accrued and Other Liabilities [Member]        
Class Of Stock [Line Items]        
Fair value of the embedded derivative $ 1,500   $ 1,500 $ 1,600
Embedded Derivative [Member]        
Class Of Stock [Line Items]        
Participating right in dividends and liquidating distributions expressed in number of common shares     303,646 303,646
Embedded Derivative [Member] | Common Stock Shares [Member]        
Class Of Stock [Line Items]        
Common stock per share $ 5.18   $ 5.18 $ 5.52
Series E Redeemable Preferred Stock [Member]        
Class Of Stock [Line Items]        
Preferred stock cumulative dividend rate     14.00%  
Participating right in dividends and liquidating distributions expressed in number of common shares     303,646  
Series E Redeemable Preferred Stock [Member] | April 2021        
Class Of Stock [Line Items]        
Increase in preferred stock cumulative dividend rate     0.50%  
Series E Redeemable Preferred Stock [Member] | April 2022        
Class Of Stock [Line Items]        
Increase in preferred stock cumulative dividend rate     0.50%  
Series E Redeemable Preferred Stock [Member] | April 2023        
Class Of Stock [Line Items]        
Increase in preferred stock cumulative dividend rate     1.00%  
Series F Redeemable Preferred Stock [Member]        
Class Of Stock [Line Items]        
Common stock voting rights shares 456,225   456,225