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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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 24,172	$ 10,602	$ 36,234	$ 40,806
Shares of common stock and common stock equivalents:
Weighted averages shares used in basic computation	135,895	131,533	134,990	131,235
Dilutive effect of stock options and unvested restricted stock	2,056	6,725	2,630	7,266
Weighted averages shares used in dilutive computation	137,951	138,258	137,620	138,501
Basic earnings per share	$ 0.18	$ 0.08	$ 0.27	$ 0.31
Dilutive earnings per share	$ 0.18	$ 0.08	$ 0.26	$ 0.29

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.