Annual report pursuant to Section 13 and 15(d)

Share-based Compensation - Weighted Average Assumptions Used in Estimating Fair Value (Detail)

v3.10.0.1
Share-based Compensation - Weighted Average Assumptions Used in Estimating Fair Value (Detail) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility   36.00% 41.00%
Risk-free interest rate   2.20% 1.60%
Dividend yield   0.40% 0.60%
Expected term   6 years 6 years
Performance Shares Member Excess [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value (in USD per share) $ 29.25 $ 33.92 $ 20.05
Expected volatility 35.00% 34.00% 30.00%
Risk-free interest rate 2.10% 1.10% 0.90%
Dividend yield 0.00% 0.00% 0.00%