Earnings Per Share - Reconciliation of Basic and Diluted Shares Amounts (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator
Net Income (Loss)	$ 18,172	$ 40,405	$ 67,065	$ 137,230
Effect of dilutive securities
Charges associated with convertible debt instruments, net of tax	0	0	0	387
Numerator for diluted earnings per share - net income available to common stockholders after the effect of dilutive securities	$ 18,172	$ 40,405	$ 67,065	$ 137,617
Denominator
Weighted average shares used in computing net income per share - basic	55,766	55,498	55,688	55,432
Effect of dilutive shares
Options and stock units	439	673	469	663
Convertible Senior Notes	735	1,131	776	1,501
Dilutive effect of unvested performance stock units	0	2	0	2
Dilutive potential common shares	1,174	1,806	1,245	2,166
Denominator for diluted earnings per share - adjusted weighted average shares used in computing net income per share - diluted	56,940	57,304	56,933	57,598
Earnings per share:
Basic	$ 0.33	$ 0.73	$ 1.2	$ 2.48
Diluted (Note 12)	$ 0.32	$ 0.71	$ 1.18	$ 2.39