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Equity Incentive Compensation Plans and Other Long-term Incentive Programs - Non-Cash Stock-Based Compensation Cost Related to Equity Awards (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Stock Based Compensation [Line Items]          
Non-cash stock-based compensation equity awards $ 1,550 $ 2,296 $ 2,006 $ 5,018  
Unrecognized compensation expense 5,100   $ 5,100    
Unrecognized compensation expense, recognition period     1 year 9 months 18 days    
Nonvested Equity Shares          
Stock Based Compensation [Line Items]          
Non-cash stock-based compensation equity awards 1,150 1,533 $ 2,300 3,329  
Nonvested Equity Common Stock Units          
Stock Based Compensation [Line Items]          
Non-cash stock-based compensation equity awards 202 318 482 612  
Nonvested Performance Cash Units          
Stock Based Compensation [Line Items]          
Nonvested performance cash units 198 $ 445 (776) $ 1,077  
Nonvested performance-based cash units accounted for as liability awards $ 300   $ 300   $ 1,200