XML 30 R63.htm IDEA: XBRL DOCUMENT v3.19.3
Stock-Based Compensation Plans - Summary of Transactions of the Company's Stock Option Plans (Detail) - Stock Options Plan [Member]
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Number of Options, Beginning balance | shares 545,249
Exercised, Number of Options | shares (89,119)
Forfeited, Number of Options | shares (11,845)
Outstanding, Number of Options, Ending balance | shares 524,054
Outstanding, Weighted Average Exercise Price, Beginning balance $ 32.46
Exercised, Weighted Average Exercise Price 13.23
Forfeited, Weighted Average Exercise Price 41.62
Outstanding, Weighted Average Exercise Price, Ending balance 32.52
Outstanding, Weighted Average Grant-Date Fair Value 36.06
Exercised 29.30
Forfeited, Weighted Average Grant-Date Fair Value 36.25
Outstanding, Weighted Average Grant-Date Fair Value $ 41.44
Discount [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, Number of Options | shares 67,230
Granted, Weighted Average Exercise Price $ 0.00
Granted, Weighted Average Grant-Date Fair Value $ 71.54
Market Value [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, Number of Options | shares 12,539
Granted, Weighted Average Exercise Price $ 81.07
Granted, Weighted Average Grant-Date Fair Value $ 22.69