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Shareholders' Equity - Summary of Outstanding Shares of Common Stock (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Shares outstanding at beginning of year	43,614	43,550	43,420
Treasury shares issued for:
Restricted stock awards	304	28	108
Employee stock options exercised	41	36	22
Shares outstanding at end of year	43,959	43,614	43,550

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Number of shares issued which are neither cancelled nor held in the treasury.

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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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