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Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net cash provided from operating activities included:
Income taxes (refunded) paid to taxing authorities	$ (162)	$ 196
Interest paid	37,541	29,636
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	$ 1,690	$ 1,194

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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