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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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 7,955	$ 23,288	$ 23,678	$ 59,522
Shares of common stock and common stock equivalents:
Weighted average common shares used in basic computation	134,046	136,582	134,541	135,527
Dilutive effect of common stock equivalents	1,144	1,599	1,042	2,306
Weighted average shares used in dilutive computation	135,190	138,181	135,583	137,833
Basic earnings per share	$ 0.06	$ 0.17	$ 0.17	$ 0.44
Diluted earnings per share	$ 0.06	$ 0.17	$ 0.17	$ 0.43

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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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