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Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net cash provided from operating activities included:
Income taxes paid to taxing authorities	$ 436	$ 309
Interest paid	99,828	95,536
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$ 29,695	$ 13,569

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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