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Description of Operations and Summary of Significant Accounting Policies - Schedule of Reconciliation of Basic and Diluted Net Income (Loss) per Share Calculation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income (loss)	$ 24,316	$ 57,055	$ (3,524)	$ 10,688
Weighted average shares used to compute net income per share:
Basic	62,582	59,798	62,383	59,499
Dilutive effect of potential common shares	6,440	8,954	0	9,855
Diluted	69,022	68,752	62,383	69,354
Net income (loss) per share:
Basic	$ 0.39	$ 0.95	$ (0.06)	$ 0.18
Diluted	$ 0.35	$ 0.83	$ (0.06)	$ 0.15

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