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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
BASIC EPS:        
Net loss attributed to common stockholders $ (49,447) $ (10,713) $ (78,061) $ (45,130)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 207,499 220,093 209,671 220,436
Basic net loss per common share $ (0.24) $ (0.05) $ (0.37) $ (0.21)
DILUTED EPS:        
Net loss attributed to common stockholders $ (49,447) $ (10,713) $ (78,061) $ (45,130)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 207,499 220,093 209,671 220,436
Weighted average number of diluted common shares outstanding 207,499 220,093 209,671 220,436
Diluted net loss per common share $ (0.24) $ (0.05) $ (0.37) $ (0.21)
Potentially dilutive securities excluded as anti-dilutive 10,289 9,903 10,289 9,903