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Significant Accounting Policies - Summary of Reconciliation of Basic and Diluted Net Income (Loss) Per Share Calculation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 116,003	$ (23,421)	$ 70,592	$ (64,817)
Weighted average number of common shares used to calculate net income (loss) per share:
Basic	86,445	83,750	86,077	83,309
Dilutive effect of potential common shares	5,283	0	5,992	0
Diluted	91,728	83,750	92,069	83,309
Net income (loss) per share:
Basic	$ 1.34	$ (0.28)	$ 0.82	$ (0.78)
Diluted	$ 1.26	$ (0.28)	$ 0.77	$ (0.78)

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