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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 9,424	$ 6,880
Shares of common stock and common stock equivalents:
Weighted average common shares used in basic computation	135,329	134,385
Dilutive effect of common stock equivalents	1,139	1,124
Weighted average common shares used in dilutive computation	136,468	135,509
Basic earnings per share	$ 0.07	$ 0.05
Diluted earnings per share	$ 0.07	$ 0.05

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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