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Stockholder's Equity - Activity Relating to Common Shares (Detail) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Issued shares, beginning balance (in shares) 45,778 45,324 45,525
Treasury shares, beginning balance (in shares) (11,043) (10,272) (10,415)
Outstanding shares, beginning balance (in shares) 34,735 35,052 35,110
Shares repurchased (in shares) (688) (771) (441)
Vesting of performance share units (in shares) 127 115  
Shares reissued (in shares)     584
Options exercised (in shares) 1,890 804 124
Common stock issued (in shares) 80 26  
Shares acquired through cashless exercise (in shares) (1,361) (491) (325)
Issued shares, shares cancelled (in shares) (1,361) (491) (325)
Treasury shares, shares cancelled (in shares) 1,361 491 325
Issued shares, ending balance (in shares) 46,514 45,778 45,324
Treasury shares, ending balance (in shares) (11,731) (11,043) (10,272)
Outstanding shares, ending balance (in shares) 34,783 34,735 35,052