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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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 3,651	$ 24,172	$ 15,723	$ 36,234
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	136,503	135,895	137,051	134,990
Dilutive effect of common stock equivalents	771	2,056	798	2,630
Weighted averages shares used in dilutive computation	137,274	137,951	137,849	137,620
Basic earnings per share	$ 0.03	$ 0.18	$ 0.11	$ 0.27
Dilutive earnings per share	$ 0.03	$ 0.18	$ 0.11	$ 0.26

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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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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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