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Stockholders' Equity - Activity Relating to Common Shares (Detail) shares in Thousands	9 Months Ended
	Sep. 30, 2018 shares
Equity [Abstract]
Issued shares, beginning balance	45,778
Treasury shares, beginning balance	(11,043)
Outstanding shares, beginning balance	34,735
Shares repurchased	(342)
Vesting of performance share units	127
Stock option exercises	1,325
Restricted stock grants	50
Shares acquired through cashless exercise	(962)	[1]
Issued shares, shares cancelled	(962)
Treasury shares, shares cancelled	962
Issued shares, ending balance	46,318
Treasury shares, ending balance	(11,385)
Outstanding shares, ending balance	34,933
[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.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Number of share options (or share units) exercised during the current period.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Number of shares of common and preferred stock retired from treasury during the period.

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Stock issued during period common shares cancelled.

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Stock issued during period common shares vesting of performance share units.

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