Supplemental Information Referable to Consolidated Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Payments (Refunds)
Interest (exclusive of amount capitalized)	$ 207,745	$ 205,088	$ 172,653
Income taxes	20,374	(29,874)	(15,745)
Noncash Investing and Financing Activities
Accrued liabilities for purchases of property, plant & equipment	9,627	7,226	8,200
Fair value of noncash assets and liabilities exchanged	0	25,994	0
Stock issued for pension contribution (Note 13)	0	0	53,864
Amounts referable to business acquisitions
Liabilities assumed	0	13,912	150
Fair value of equity consideration	$ 0	$ 18,529	$ 0

Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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