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Debt and Credit Facilities - Total Debt Outstanding (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |
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Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 5.25% Senior Notes due April 2023 [Member] | Dec. 31, 2012 5.25% Senior Notes due April 2023 [Member] | Mar. 31, 2013 12% Senior Notes due February 2014 [Member] | Dec. 31, 2012 12% Senior Notes due February 2014 [Member] | Sep. 30, 2012 12% Senior Notes due February 2014 [Member] | Mar. 31, 2013 7.875% Senior Notes due June 2017 [Member] | Dec. 31, 2012 7.875% Senior Notes due June 2017 [Member] | Mar. 31, 2013 8.125% Senior Notes due September 2019 [Member] | Dec. 31, 2012 8.125% Senior Notes due September 2019 [Member] | Mar. 31, 2013 6.50% Senior Notes due December 2020 [Member] | Dec. 31, 2012 6.50% Senior Notes due December 2020 [Member] | Mar. 31, 2013 8.375% Senior Notes due September 2021 [Member] | Dec. 31, 2012 8.375% Senior Notes due September 2021 [Member] | Mar. 31, 2013 6.875% Senior Notes due July 2033 [Member] | Dec. 31, 2012 6.875% Senior Notes due July 2033 [Member] | Mar. 31, 2013 Term Loan A Facility [Member] | Mar. 31, 2013 Term Loan B Facility due October 2018 [Member] | Mar. 31, 2013 Term Loan A Facility due October 2016 [Member] | Dec. 31, 2012 Term Loan A Facility due October 2016 [Member] | Mar. 31, 2013 Term Loan B Facility due October 2018 [Member] | Dec. 31, 2012 Term Loan B Facility due October 2018 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  | 5.25% | 5.25% | 12.00% | 12.00% | 12.00% | 7.875% | 7.875% | 8.125% | 8.125% | 6.50% | 6.50% | 8.375% | 8.375% | 6.875% | 6.875% |  |  |  |  |  |
Unamortized lender fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.6 | $ 15.4 | $ 10.1 | $ 10.7
Unamortized discount |  |  |  |  |  |  |  |  |  | 5.5 |  |  |  |  |  |  | 1.4 | 1.4 |  |  |  |  | 14.8 | 15.6
Payments of long-term debt | 428.0 | 27.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.0 | 2.0 |  |  |  |
Repurchase aggregate principal amount |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate | 6.20% |  | 6.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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