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Net Income (Loss) Per Share Attributable to Common Shareholders - Schedule of Computation of Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]                
Net loss of joint venture $ (92,439) $ (79,656) $ (69,731) $ 138,423 $ (53,699) $ (48,408) $ (241,826) $ 36,316
Basic weighted-average common shares outstanding 70,143,481     54,829,057     64,159,224 53,380,123
Effect of potentially dilutive securities:                
Diluted weighted-average common shares outstanding 70,143,481     57,598,901     64,159,224 55,821,420
Basic net income (loss) per common share $ (1.32)     $ 2.52     $ (3.77) $ 0.68
Diluted net income (loss) per common share $ (1.32)     $ 2.40     $ (3.77) $ 0.65
Stock Options [Member]                
Effect of potentially dilutive securities:                
Effect of potentially dilutive securities       2,612,354       2,326,824
Unvested Restricted Common Shares [Member]                
Effect of potentially dilutive securities:                
Effect of potentially dilutive securities       157,490       114,473