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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

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