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Earnings Per Share - Additional Information (Detail) - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options to purchase common shares included in the computation of diluted EPS 0.4   0.9
Restricted Stock Awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options to purchase common shares not included in the computation of diluted EPS 0.7 0.3 0.2
Stock options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options to purchase common shares not included in the computation of diluted EPS   0.6