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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
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Stock Based Compensation [Line Items]      
Non-cash stock-based compensation equity awards $ 456 $ 2,722  
Unrecognized compensation expense $ 6,800    
Unrecognized compensation expense, recognition period 1 year 10 months 24 days    
Nonvested Equity Shares      
Stock Based Compensation [Line Items]      
Non-cash stock-based compensation equity awards $ 1,150 1,796  
Nonvested Equity Common Stock Units      
Stock Based Compensation [Line Items]      
Non-cash stock-based compensation equity awards 280 294  
Nonvested Performance Cash Units      
Stock Based Compensation [Line Items]      
Nonvested performance cash units (974) $ 632  
Nonvested performance-based cash units accounted for as liability awards $ 200   $ 1,200