Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic earnings (loss) per share:
Net income (loss) attributable to common stockholders (numerator)	$ (45,411)	$ 1,252	$ (78,838)	$ 8,142
Shares used in computation (denominator)
Weighted-average common shares outstanding	92,116	91,177	91,954	91,064
Basic earnings (loss) per share	$ (0.49)	$ 0.01	$ (0.86)	$ 0.09
Diluted earnings (loss) per share:
Net income (loss) attributable to common stockholders (numerator)	$ (45,411)	$ 1,252	$ (78,838)	$ 8,142
Shares used in computation (denominator)
Weighted-average common shares outstanding	92,116	91,177	91,954	91,064
Effect of dilutive securities:
Weighted-average diluted shares	92,116	92,786	91,954	92,852
Diluted earnings (loss) per share	$ (0.49)	$ 0.01	$ (0.86)	$ 0.09
Stock Options
Effect of dilutive securities:
Stock options, Restricted stock units, shares		1,188		1,248
Restricted Stock Units
Effect of dilutive securities:
Stock options, Restricted stock units, shares		421		540