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Stockholder's Equity - Activity Relating to Common Shares (Detail) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Issued shares, beginning balance 45,324 45,525 44,769
Treasury shares, beginning balance (10,272) (10,415) (9,667)
Outstanding shares, beginning balance 35,052 35,110 35,102
Shares repurchased (771) (441) (748)
Options exercised 804 124 751
Restricted stock grant     615
Shares acquired through cashless exercise [1] (491) (325) (610)
Issued shares, shares cancelled (491) (325) (610)
Issued shares, ending balance 45,778 45,324 45,525
Shares reissued   584  
Vesting of performance share units 115    
Common stock issued 26    
Treasury shares, shares cancelled 491 325 610
Treasury shares, ending balance (11,043) (10,272) (10,415)
Outstanding shares, ending balance 34,735 35,052 35,110
[1] All shares acquired represent shares tendered to cover the strike price for options and tax withholdings on the intrinsic value of options exercised or performance share units or restricted stock (as defined in “—Note 9 (Share-Based Compensation)”) vested. These shares have been cancelled by the Company.