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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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 23,288	$ 10,623	$ 59,522	$ 51,429
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	136,582	131,778	135,527	131,418
Dilutive effect of stock options and unvested restricted stock	1,599	6,568	2,306	7,058
Weighted averages shares used in dilutive computation	138,181	138,346	137,833	138,476
Basic earnings per share	$ 0.17	$ 0.08	$ 0.44	$ 0.39
Dilutive earnings per share	$ 0.17	$ 0.08	$ 0.43	$ 0.37

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

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