Net Income per Share (Net Income Per Basic and Diluted Share) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Income used to compute net income per diluted share	$ 84,498	$ 72,883
Total weighted-average shares used to compute net income per basic share (in Shares)	162,829	151,198
Diluted (in Shares)	170,412	164,571
Basic (in Dollars per Share)	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic
Net income per diluted share (in Dollars per Share)	$ 0.50us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted
Debt Instrument [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants	1,927	0
Series 2012 Notes [Member]
Debt Instrument [Line Items]
Assumed conversion of debt notes (in Shares)	666	6,903
May 2015 Notes [Member]
Debt Instrument [Line Items]
Assumed conversion of debt notes (in Shares)	4,944	6,381
Stock Options [Member]
Debt Instrument [Line Items]
Additional shares included in the calculation of diluted EPS (in Shares)	18	21
Restricted Stock [Member]
Debt Instrument [Line Items]
Additional shares included in the calculation of diluted EPS (in Shares)	28	68

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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