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Earnings Per Share - (Reconciliation of Basic and Diluted Shares Amounts) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 14,552	$ 1,659	$ 40,228	$ 17,807
Weighted average shares used in computing net income per share - diluted	52,545	50,852	52,341	47,087
Effect of dilutive shares:
Stock options and restricted stock awards	916	957	951	843
Dilutive effect of unvested performance stock units	8		8
Dilutive potential common shares	924	957	959	843
Weighted average shares used in computing net income per share - diluted	53,469	51,809	53,300	47,930
Earnings per share:
Basic	$ 0.28	$ 0.03	$ 0.77	$ 0.38
Diluted	$ 0.27	$ 0.03	$ 0.75	$ 0.37

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