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Indebtedness - Debt Outstanding (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Bank debt percentage	1.80%		1.80%
7.50% Senior Subordinated notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	7.50%		7.50%
7.25% Senior Subordinated notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	7.25%		7.25%
8.00% Senior Subordinated notes due 2019 [Member]
Debt Instrument [Line Items]
Discount on Senior Subordinated notes	11,131		12,033
Interest rate on senior subordinated notes	8.00%		8.00%
6.75% Senior Subordinated notes due 2020 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	6.75%		6.75%
5.75% Senior Subordinated notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	5.75%		5.75%
5.00% Senior Subordinated notes due 2022 [Member]
Debt Instrument [Line Items]
Discount on Senior Subordinated notes		$ 10,500
Interest rate on senior subordinated notes	5.00%		5.00%

Gross amount, as of the balance sheet date, of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings in periods after one year or beyond the normal operating cycle, if longer, over the life of the long-term debt instruments to which such costs pertain.

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