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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net income (loss) attributable to common stock $ (60,002) $ 21,407 $ (30,046) $ 34,982
Income allocable to unvested restricted shares   (89)   (141)
Basic income (loss) attributable to common stock (60,002) 21,318 (30,046) 34,841
Diluted income (loss) attributable to common stock $ (60,002) $ 21,318 $ (30,046) $ 34,841
Basic income (loss) attributable to common stock, Shares 208,904 105,457 198,910 105,457
Diluted income (loss) attributable to common stock, Shares 208,904 105,457 198,910 105,457
Basic income (loss) attributable to common stock, Per Share $ (0.29) $ 0.20 $ (0.15) $ 0.33
Diluted income (loss) attributable to common stock, Per Share $ (0.29) $ 0.20 $ (0.15) $ 0.33