Net Income (Loss) Per Share - Calculation of Net Income (Loss) and Number of Shares Used to Compute Basic and Diluted Earnings Per Share (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	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ 109,848	$ (63,160)	$ 56,061	$ (115,835)
Shares used in basic computation (in shares)	191,485	188,598	190,894	188,220
Dilutive impact of employee equity award plans (in shares)	3,084	0	2,610	0
Shares used in diluted computation (in shares)	194,569	188,598	193,504	188,220
Basic (in usd per share)	$ 0.57	$ (0.33)	$ 0.29	$ (0.62)
Diluted (in usd per share)	$ 0.56	$ (0.33)	$ 0.29	$ (0.62)
Antidilutive securities excluded from diluted net income per share calculations (shares)	10,100	14,800	10,600	14,800
Convertible Note Warrant
Class of Warrant or Right [Line Items]
Underlying common stock shares covered in hedge (shares)	21,500		21,500
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 12.00		$ 12.00		$ 12.00