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Employee Retirement and Postretirement Benefits - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 12, 2020
Mar. 17, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stock options, shares granted         4,140,378  
Stock options exercised         38,383  
Stock options forfeited         71,008  
Stock options, shares expired         2,929,350  
Stock-based compensation expense     $ 4,680 $ 2,272 $ 8,283 $ 6,731
Employee Contribution         100.00%  
Percentage of employees contribution matched by the company         4.00%  
Employer Contribution     $ 300 $ 300 $ 900 $ 1,000
Option Exchange Program [Member]            
Stock options forfeited         2,896,383  
Common stock, shares issued under ESPP 6,664,773          
Option Exchange Program [Member] | Maximum            
Stock-based compensation expense         $ 1,000  
Employee Stock Purchase Plan [Member]            
Common stock, shares issued under ESPP         327,085  
Restricted Stock Units (RSUs) [Member]            
Share units issued   186,139     193,154  
Share units granted         3,033,702  
Share units forfeited         549,493  
Share units vested         2,146,750  
Deferred Stock Units [Member]            
Share units granted         192,702  
Share units vested         26,508  
Restricted Stock [Member]            
Share units vested         25,977