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Stockholders' Equity - Activity Relating to Common Shares (Detail)
shares in Thousands
 3 Months Ended
Mar. 31, 2018
shares
Equity [Abstract]  
Issued shares, beginning balance 45,778
Treasury shares, beginning balance (11,043)
Outstanding shares, beginning balance 34,735
Shares repurchased (93)
Vesting of performance share units 127
Stock option exercises 804
Restricted stock grants 50
Shares acquired through cashless exercise (611) [1]
Issued shares, shares cancelled (611)
Treasury shares, shares cancelled 611
Issued shares, ending balance 46,148
Treasury shares, ending balance (11,136)
Outstanding shares, ending balance 35,012
[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 vested. These shares have been cancelled by the Company.