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
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share Basic And Diluted [Abstract]
Net income (loss)	$ (35,592)	$ 1,424
Denominator:
Weighted average common shares outstanding, basic	84,317,767	86,101,741
Basic earnings per share:
Net income (loss) per share	$ (0.42)	$ 0.02
Denominator:
Weighted average common shares outstanding, basic	84,317,767	86,101,741
Dilutive securities:
Stock options and restricted stock units		1,051,246
Weighted average common shares outstanding, diluted	84,317,767	87,152,987
Diluted earnings per share:
Net income (loss) per share	$ (0.42)	$ 0.02