The Company and Significant Accounting Policies - Reconciliation of Basic and Diluted Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share Basic And Diluted [Abstract]
Net income (loss)	$ 5,241	$ 8,735	$ 10,525	$ 13,123
Denominator:
Weighted average common shares outstanding, basic	87,832,430	89,276,794	87,682,734	88,982,009
Basic earnings per share:
Net income (loss) per share, basic	$ 0.06	$ 0.10	$ 0.12	$ 0.15
Net income (loss)	$ 5,241	$ 8,735	$ 10,525	$ 13,123
Denominator:
Weighted average common shares outstanding, basic	87,832,430	89,276,794	87,682,734	88,982,009
Dilutive securities:
Stock options and restricted stock units	2,259,305	1,925,938	2,406,945	2,092,928
Weighted average common shares outstanding, diluted	90,091,735	91,202,732	90,089,679	91,074,937
Diluted earnings per share:
Net income (loss) per share	$ 0.06	$ 0.10	$ 0.12	$ 0.14