The Company and Significant Accounting Policies - Reconciliation of Basic and Diluted Income (Loss) Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share Basic And Diluted [Abstract]
Net income (loss)	$ 8,057	$ (21,384)	$ 21,180	$ (17,268)
Denominator:
Weighted average common shares outstanding, basic	89,179,192	87,959,856	89,048,459	87,170,106
Basic earnings per share:
Net income (loss) per share, basic	$ 0.09	$ (0.24)	$ 0.24	$ (0.20)
Net income (loss)	$ 8,057	$ (21,384)	$ 21,180	$ (17,268)
Denominator:
Weighted average common shares outstanding, basic	89,179,192	87,959,856	89,048,459	87,170,106
Dilutive securities:
Stock options and restricted stock units	2,060,606		2,082,154
Weighted average common shares outstanding, diluted	91,239,798	87,959,856	91,130,613	87,170,106
Diluted earnings per share:
Net income (loss) per share, diluted	$ 0.09	$ (0.24)	$ 0.23	$ (0.20)