Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ (37,327)	$ 76,452
Net income from discontinued operations	6,216	0
Net income (loss)	$ (31,111)	$ 76,452
Weighted-average shares used to calculate basic EPS	68,132	56,661
Effect of dilutive securities:
Employee equity awards	0	566
Weighted-average shares used to calculate diluted EPS	68,132	57,227
Basic EPS from continuing operations (in dollars per share)	$ (0.55)	$ 1.35
Basic EPS from discontinued operations (in dollars per share)	0.09	0.00
Basic EPS (in dollars per share)	(0.46)	1.35
Diluted EPS from continuing operations (in dollars per share)	(0.55)	1.34
Diluted EPS from discontinued operations (in dollars per share)	0.09	0.00
Diluted EPS (in dollars per share)	$ (0.46)	$ 1.34