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Redeemable Preferred Stocks - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Class Of Stock [Line Items]        
Fair value of the embedded derivative $ 1,118 $ 1,118   $ 1,642
Non-Operating Other Income [Member]        
Class Of Stock [Line Items]        
Unrealized gain on change in fair value of the embedded derivative 700 500 $ 1,100  
Other Noncurrent Accrued and Other Liabilities [Member]        
Class Of Stock [Line Items]        
Fair value of the embedded derivative $ 1,100 $ 1,100   $ 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 $ 3.90 $ 3.90   $ 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