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Earnings Per Share - Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based compensation awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total anti-dilutive securities (shares) 2,246,181 1,069,225 2,301,663 1,069,225