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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income $ 71 $ 42,880
Denominator:    
Basic weighted-average shares outstanding (shares) 141,865,270 151,464,547
Effect of dilutive shares:    
Stock options and unvested restricted stock units (shares) 524,893 1,311,304
Diluted weighted-average shares outstanding (shares) 142,390,163 152,775,851
Earnings per share    
Basic (in dollars per share) $ 0.00 $ 0.28
Diluted (in dollars per share) $ 0.00 $ 0.28
Antidilutive stock options and unvested restricted stock units not included in diluted earnings per share (in shares) 2,864,509 1,248,483