Components of Change in Other Assets and Liabilities Net (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule of Cash Flow, Supplemental
Other current and noncurrent assets	$ (42)	$ (9,694)
Accrued salaries, benefits and payroll taxes	(1,307)	(1,270)
Accrued insurance and other taxes	5,761	7,767
Accrued income taxes	18,369	7,817
Accrued pension, postretirement and postemployment benefits	(10,431)	(14,693)
Other current and noncurrent liabilities	13,228	14,956
Change in other assets and liabilities	$ 25,578	$ 4,883