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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, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 6,880	$ 12,072
Shares of common stock and common stock equivalents:
Weighted average common shares used in basic computation	134,385	135,467
Dilutive effect of common stock equivalents	1,124	990
Weighted average common shares used in dilutive computation	135,509	136,457
Basic earnings per share	$ 0.05	$ 0.09
Diluted earnings per share	$ 0.05	$ 0.09

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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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