Net Income per Share (Net Income Per Basic and Diluted 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
Numerator
Income used to compute net income per diluted share	$ 4,148	$ 78,264	$ 60,035	$ 162,762
Denominator
Total weighted-average shares used to compute net income per basic share (in Shares)	163,791	163,544	163,729	163,188
Diluted (in Shares)	164,029	165,384	163,920	167,376
Basic (in Dollars per Share)	$ 0.03	$ 0.48	$ 0.37	$ 1.00
Net income per diluted share (in Dollars per Share)	$ 0.03	$ 0.47	$ 0.37	$ 0.97
Debt Instrument [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	0	503	0	1,551
Series 2012 Notes [Member]
Debt Instrument [Line Items]
Assumed conversion of debt notes (in Shares)	0	0	0	266
May 2015 Notes [Member]
Debt Instrument [Line Items]
Assumed conversion of debt notes (in Shares)	0	1,184	0	2,235
Stock Options [Member]
Debt Instrument [Line Items]
Additional shares included in the calculation of diluted EPS (in Shares)	0	19	0	19
Restricted Stock [Member]
Debt Instrument [Line Items]
Additional shares included in the calculation of diluted EPS (in Shares)	238	134	191	117