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Net Income (Loss) Per Common Share - Computations of Basic and Diluted Income (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share Reconciliation [Abstract]                
Net loss $ (748,790) $ (167,583) $ 166,195 $ (1,388) $ (750,178) $ (711,777) $ (1,716,297) $ (1,746,481)
Participating basic earnings [1]             (251) (245)
Basic net loss attributed to common stockholders           (711,777) (1,716,548) (1,746,726)
Reallocation of participating earnings [1]           0 0 0
Diluted net loss attributed to common stockholders           $ (711,777) $ (1,716,548) $ (1,746,726)
Net loss per common share:                
Basic $ (3.12) $ (0.70) $ 0.67 $ (0.01) $ (3.10) $ (2.95) $ (6.92) $ (7.10)
Diluted $ (3.12) $ (0.70) $ 0.66 $ (0.01) $ (3.10) $ (2.95) $ (6.92) $ (7.10)
[1] Restricted stock Liability Awards represent participating securities because they participate in nonforfeitable dividends or distributions with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Participating securities, however, do not participate in undistributed net losses.