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Earnings (Loss) Per Share - Anti-dilutive Securities Excluded from Computation of Earnings (Loss) Per Share (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based compensation awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total anti-dilutive securities (shares) 710,000 862,417 711,000 862,417