Components of Change in Other Assets And Liabilities Net (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Schedule of Cash Flow, Supplemental
Other current and noncurrent assets	$ (9,694)	$ 2,325
Accrued salaries, benefits and payroll taxes	(1,270)	(2,324)
Accrued insurance and other taxes	7,767	8,366
Accrued income taxes	7,817	22,208
Accrued pension, postretirement and postemployment benefits	(14,693)	(16,046)
Other current and noncurrent liabilities	14,956	10,450
Other assets and liabilities, net	$ 4,883	$ 24,979