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Net Income (Loss) Per Share - Schedule of Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss) - basic and diluted	$ 50,764	$ (11,125)	$ 3,033	$ (149,436)
Weighted-average common shares outstanding:
Basic	90,555,000	88,325,000	90,064,000	87,894,000
Effect of dilutive securities:
Employee stock purchase program	7,000	0	2,000	0
Stock options	3,352,000	0	3,322,000	0
Restricted stock	629,000	0	558,000	0
2024 Notes	2,255,000	0	1,326,000	0
Diluted	96,798,000	88,325,000	95,272,000	87,894,000
Net income (loss) per share:
Basic	$ 0.56	$ (0.13)	$ 0.03	$ (1.70)
Diluted	$ 0.52	$ (0.13)	$ 0.03	$ (1.70)

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