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Indebtedness - Debt Outstanding (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Bank debt percentage	3.70%	3.70%
8.00% Senior Subordinated notes due 2019
Debt Instrument [Line Items]
Discount on Senior Subordinated notes	10,495	10,815
Interest rate on senior subordinated notes	8.00%	8.00%
7.25% Senior Subordinated notes due 2018
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	7.25%	7.25%
6.75% Senior Subordinated notes due 2020
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	6.75%	6.75%
5.75% Senior Subordinated notes due 2021
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	5.75%	5.75%
5.00% Senior Subordinated notes due 2022
Debt Instrument [Line Items]
Interest rate on senior subordinated notes	5.00%	5.00%
5.00% Senior Subordinated notes due 2023
Debt Instrument [Line Items]
Discount on Senior Subordinated notes	11,200
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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