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Debt (Schedule of Long Term Debt Instruments) (Parenthetical) (Detail) | Dec. 31, 2013 Capital Lease Obligations [Member] | Dec. 31, 2013 Machinery and Equipment [Member] Equipment Notes Payable [Member] | Dec. 31, 2013 Unsecured Debt [Member] 4.875% Senior Notes [Member] Senior Notes [Member] | Dec. 31, 2012 Unsecured Debt [Member] 7.625% Senior Notes [Member] Senior Notes [Member] | Dec. 31, 2013 Unsecured Debt [Member] 2011 4.0% Notes [Member] Convertible Debt [Member] | Dec. 31, 2013 Unsecured Debt [Member] 2011 4.25% Notes [Member] Convertible Debt [Member] | Dec. 31, 2013 Unsecured Debt [Member] 2009 4.0% Notes [Member] Convertible Debt [Member] | Dec. 31, 2013 Unsecured Debt [Member] 2009 4.25% Notes [Member] Convertible Debt [Member]
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 4.875% | 7.625% | 4.00% | 4.25% | 4.00% | 4.25%
Debt instrument, weighted average interest rate | 2.70% | 3.20% |  |  |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 Weighted average interest rate of debt outstanding. + References No definition available. + Details
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