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Senior Notes - Summary of Fixed-Rate Senior Notes (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Senior Notes [Line Items] |  |  |  |
Senior Notes | $ 1,825,200,000 |  | $ 1,658,600,000 |
Debt premium (discount) | 4,000,000 |  | (5,400,000) |
Senior notes | 2,147,097,000 |  | 2,139,718,000 |
Debt Instrument, Stated Percentage Rate, Minimum | 4.625% |  |  |
Debt Instrument, Stated Percentage Rate, Maximum | 9.625% |  |  |
Debt Instrument Effective Interest Rate Minimum | 4.80% |  |  |
Debt Instrument Effective Interest Rate Maximum | 9.90% |  |  |
Maturity Date Range, Start | May 31, 2015 |  |  |
Maturity Date Range, End | Jul. 31, 2022 |  |  |
Senior Convertible Notes Due 2040 [Member] |  |  |  |
Senior Notes [Line Items] |  |  |  |
Senior Convertible Notes | 317,900,000 | [1] | 307,600,000 | [1]
Debt Instrument, Stated Percentage | 1.75% | [1] |  |
Debt Instrument Effective Interest Rate | 5.30% | [1] |  |
Debt Instrument, Maturity Date | Nov. 30, 2040 | [1] |  |
Senior Convertible Notes Due 2012 [Member] |  |  |  |
Senior Notes [Line Items] |  |  |  |
Senior Convertible Notes | $ 0 |  | $ 178,900,000 |
[1] | The Company may redeem the senior convertible notes any time on or after November 15, 2015, in whole or in part, for cash equal to 100% of the principal amount of the notes plus accrued and unpaid interest through, but excluding, the redemption date. In addition, the holders of the senior convertible notes may require the Company to repurchase their notes in whole or in part on specified dates, the first of which is November 15, 2015.

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- Definition Senior Notes not including discount or accretion. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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