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Earnings Per Share - Calculation of Basic and Diluted Net Loss per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
BASIC EPS:                      
Net loss attributed to common stockholders                 $ (803,692) $ (425,703) $ (321,421)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock                 188,013 203,039 218,643
Basic net loss per common share $ (0.57) $ (0.60) $ (0.81) $ (2.28) $ (0.44) $ (1.31) $ (0.24) $ (0.14) $ (4.27) $ (2.10) $ (1.47)
DILUTED EPS:                      
Net loss attributed to common stockholders                 $ (803,692) $ (425,703) $ (321,421)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock                 188,013 203,039 218,643
Weighted average number of diluted common shares outstanding                 188,013 203,039 218,643
Diluted net loss per common share $ (0.57) $ (0.60) $ (0.81) $ (2.28) $ (0.44) $ (1.31) $ (0.24) $ (0.14) $ (4.27) $ (2.10) $ (1.47)
Potentially dilutive securities excluded as anti-dilutive                 8,747 9,195 9,762