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Summary of Significant Accounting Policies - Basic and Diluted Income (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]        
Net income (loss) attributable to common stock $ (130,890) $ (1,337) $ (160,936) $ 33,645
Income allocable to unvested restricted shares 0 0 0 (141)
Basic income (loss) attributable to common stock (130,890) (1,337) (160,936) 33,504
Diluted income (loss) attributable to common stock $ (130,890) $ (1,337) $ (160,936) $ 33,504
Basic income (loss) attributable to common stock (in shares) 231,223 171,487 209,760 127,709
Diluted income (loss) attributable to common stock (in shares) 231,223 171,487 209,760 127,709
Basic income (loss) attributable to common stock (in dollars per share) $ (0.57) $ (0.01) $ (0.77) $ 0.26
Diluted income (loss) attributable to common stock (in dollars per share) $ (0.57) $ (0.01) $ (0.77) $ 0.26