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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 33,498	$ 14,552	$ 99,181	$ 40,228
Weighted average shares used in computing net income per share - basic	55,015	52,545	54,918	52,341
Effect of dilutive shares:
Options and stock units	919	916	913	951
Convertible senior notes	1,373	8	1,180	8
Dilutive effect of unvested performance stock units	61	0	61	0
Dilutive potential common shares	2,353	924	2,154	959
Weighted average shares used in computing net income per share - diluted	57,368	53,469	57,072	53,300
Earnings per share:
Basic	$ 0.61	$ 0.28	$ 1.81	$ 0.77
Diluted	$ 0.58	$ 0.27	$ 1.74	$ 0.75

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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-SubTopic 10
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