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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Parenthetical) (Detail)	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
12% Senior Notes due February 2014 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Debt interest rate	12.00%	12.00%	12.00%
7.875% Senior Notes due June 2017 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Debt interest rate	7.875%	7.875%
8.125% Senior Notes due September 2019 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Debt interest rate	8.125%	8.125%
6.50% Senior Notes due December 2020 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Debt interest rate	6.50%	6.50%
8.375% Senior Notes due September 2021 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Debt interest rate	8.375%	8.375%
5.25% Senior Notes due April 2023 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Debt interest rate	5.25%	5.25%
6.875% Senior Notes due July 2033 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Debt interest rate	6.875%	6.875%