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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net income (loss) $ (85,313) $ 116,003 $ (163,661) $ 70,592
Weighted average number of common shares used to calculate net income (loss) per share:        
Basic 89,451 86,445 88,835 86,077
Dilutive effect of potential common shares 0 5,283 0 5,992
Diluted 89,451 91,728 88,835 92,069
Net income (loss) per share:        
Basic $ (0.95) $ 1.34 $ (1.84) $ 0.82
Diluted $ (0.95) $ 1.26 $ (1.84) $ 0.77