Earnings Per Share - Reconciliation of Basic and Diluted Shares Amounts (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator
Net income	$ 28,829	$ 46,964
Effect of dilutive securities
Charges associated with convertible debt instruments, net of tax	0	387
Numerator for diluted earnings per share - net income available to common stockholders after the effect of dilutive securities	$ 28,829	$ 47,351
Denominator
Weighted average shares used in computing net income per share - basic	55,590	55,353
Effect of dilutive shares
Options and stock units	529	726
Convertible senior notes	883	2,726
Contingent consideration	44	0
Dilutive effect of unvested performance stock units	3	11
Dilutive potential common shares	1,459	3,463
Denominator for diluted earnings per share - adjusted weighted average shares used in computing net income per share - diluted	57,049	58,816
Earnings per share:
Basic	$ 0.52	$ 0.85
Diluted (Note 10)	$ 0.51	$ 0.81