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Capital Stock (Detail) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Beginning balance	248,129,430	247,144,356
Restricted stock grants	673,791	539,096
Treasury shares issued	895	15,580
Ending balance	249,222,320	248,129,430
Restricted Stock
Class Of Stock [Line Items]
Restricted stock units vested	397,774	344,937
Performance Share
Class Of Stock [Line Items]
Performance stock units issued	20,430	85,461

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

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of new stock issued during the period.

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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 treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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