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Stock Option Activity (Detail)
shares in Thousands
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Number of Shares  
Options outstanding, beginning of period | shares 3,169
Additional options granted based upon achievement of specified performance criteria | shares 81
Canceled/Expired | shares (168)
Exercised | shares (55)
Options outstanding, end of period | shares 3,027
Weighted Average Exercise Price  
Options outstanding, beginning of period | $ / shares $ 32.49
Additional options granted based upon achievement of specified performance criteria | $ / shares 32.42
Canceled/Expired | $ / shares 27.24
Exercised | $ / shares 27.17
Options outstanding, end of period | $ / shares $ 32.74