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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Parenthetical) (Detail) | Dec. 31, 2013 12% Senior Notes Due February 2014 [Member] | Dec. 31, 2012 12% Senior Notes Due February 2014 [Member] | Dec. 31, 2011 12% Senior Notes Due February 2014 [Member] | Dec. 31, 2013 7.875% Senior Notes Due June 2017 [Member] | Dec. 31, 2012 7.875% Senior Notes Due June 2017 [Member] | Dec. 31, 2013 8.125% Senior Notes Due September 2019 [Member] | Dec. 31, 2012 8.125% Senior Notes Due September 2019 [Member] | Dec. 31, 2013 6.50% Senior Notes Due December 2020 [Member] | Dec. 31, 2012 6.50% Senior Notes Due December 2020 [Member] | Nov. 30, 2012 6.50% Senior Notes Due December 2020 [Member] | Dec. 31, 2013 8.375% Senior Notes Due September 2021 [Member] | Dec. 31, 2012 8.375% Senior Notes Due September 2021 [Member] | Dec. 31, 2013 5.25% Senior Notes Due April 2023 [Member] | Mar. 31, 2013 5.25% Senior Notes Due April 2023 [Member] | Dec. 31, 2012 5.25% Senior Notes Due April 2023 [Member] | Dec. 31, 2013 6.875% Senior Notes Due July 2033 [Member] | Dec. 31, 2012 6.875% Senior Notes Due July 2033 [Member]
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate | 12.00% | 12.00% | 12.00% | 7.875% | 7.875% | 8.125% | 8.125% | 6.50% | 6.50% | 6.50% | 8.375% | 8.375% | 5.25% | 5.25% | 5.25% | 6.875% | 6.875%

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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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- Details
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