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Stock Option Activity (Detail)
shares in Thousands
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Total Options  
Options outstanding, beginning of period | shares 3,010
Additional options awarded based upon achievement of specified performance criteria | shares 106
Canceled/Expired | shares (6)
Exercised | shares (24)
Options outstanding, end of period | shares 3,086
Weighted Average Exercise Price  
Options outstanding, beginning of period | $ / shares $ 32.53
Additional options awarded based upon achievement of specified performance criteria | $ / shares 32.43
Canceled/Expired | $ / shares 42.87
Exercised | $ / shares 30.92
Options outstanding, end of period | $ / shares $ 32.52