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Stockholders' Equity - Activity Relating to Common Shares (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2017
shares
Equity [Abstract]  
Issued shares, beginning balance 45,324
Treasury shares, beginning balance (10,272)
Outstanding shares, beginning balance 35,052
Shares repurchased (761)
Vesting of performance share units 115
Stock option exercises 71
Common stock issued 26
Shares acquired through cashless exercise (63) [1]
Issued shares, shares cancelled (63)
Treasury shares, shares cancelled 63
Issued shares, ending balance 45,473
Treasury shares, ending balance (11,033)
Outstanding shares, ending balance 34,440
[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.