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Long Term Debt - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | |||||
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May 31, 2011
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May 31, 2011
0.50% Convertible Senior Notes Due 2016
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Dec. 23, 2012
0.50% Convertible Senior Notes Due 2016
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Dec. 23, 2012
0.50% Convertible Senior Notes Due 2016
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Jun. 24, 2012
0.50% Convertible Senior Notes Due 2016
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May 31, 2011
1.25% Convertible Senior Notes Due 2018
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Dec. 23, 2012
1.25% Convertible Senior Notes Due 2018
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Dec. 23, 2012
1.25% Convertible Senior Notes Due 2018
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Jun. 24, 2012
1.25% Convertible Senior Notes Due 2018
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Jun. 24, 2012
2.625% Convertible Senior Notes maturing in 2041
Note
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Dec. 23, 2012
2.625% Convertible Senior Notes maturing in 2041
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Jun. 24, 2012
2.625% Convertible Senior Notes maturing in 2041
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Dec. 23, 2012
2.625% Convertible Senior Notes maturing in 2041
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Jun. 04, 2012
2.625% Convertible Senior Notes maturing in 2041
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| Debt Instrument [Line Items] | ||||||||||||||
| Notes due | $ 450,000,000 | $ 450,000,000 | $ 450,000,000 | $ 450,000,000 | $ 450,000,000 | $ 450,000,000 | $ 450,000,000 | $ 450,000,000 | $ 699,900,000 | $ 699,900,000 | $ 699,900,000 | $ 699,900,000 | ||
| Convertible notes interest rate percentage | 0.50% | 0.50% | 0.50% | 0.50% | 1.25% | 1.25% | 1.25% | 1.25% | 2.625% | 2.625% | 2.625% | 2.625% | ||
| Initial conversion rate of common stock shares | 15.8687 | 15.8687 | 28.4781 | |||||||||||
| Convertible Senior Notes conversion price | $ 63.02 | $ 63.02 | $ 35.11 | $ 35.11 | ||||||||||
| Principal amount of convertible debt conversion increments | 1,000 | 1,000 | 1,000 | |||||||||||
| Net proceeds from the sale of Convertible Senior Notes | 835,500,000 | |||||||||||||
| Debt instruments maturity date | 2016 | 2018 | 2041 | |||||||||||
| Maximum amount of contingent interest rate | 2.10% | |||||||||||||
| Number of Debt converted to shares of common stock | 65 | |||||||||||||
| Debt converted, par value | 65,000 | |||||||||||||
| Debt converted, number of common shares issued | 137 | |||||||||||||
| Initial carrying value of liability component of convertible notes | 373,800,000 | 345,100,000 | 509,500,000 | |||||||||||
| Discount rate used to determine liability fair value | 4.29% | 4.29% | 5.27% | 5.27% | 4.28% | |||||||||
| Carrying value of equity components | 76,200,000 | 76,200,000 | 104,900,000 | 104,900,000 | 328,100,000 | 328,100,000 | ||||||||
| Unamortized discount balance | 53,100,000 | 53,100,000 | 60,300,000 | 83,700,000 | 83,700,000 | 90,400,000 | 190,300,000 | 188,600,000 | 190,300,000 | 188,600,000 | ||||
| Remaining life of bond discount, years | 3 years 4 months 24 days | 5 years 4 months 24 days | 28 years 4 months 24 days | |||||||||||
| If-converted value in excess of aggregate principal amount | 22,500,000 | |||||||||||||
| Warrant conversion price | 71.34 | 76.10 | ||||||||||||
| Shares issued under warrants | 7,100,000 | 7,100,000 | ||||||||||||
| Shares of common stock agreed to sell | 7,100,000 | 7,100,000 | ||||||||||||
| Fair value of notes | $ 432,000,000 | $ 432,000,000 | $ 446,400,000 | $ 446,400,000 | $ 880,200,000 | $ 880,200,000 | ||||||||