Components of Change in Other Assets And Liabilities Net (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Schedule of Cash Flow, Supplemental
Other current and noncurrent assets	$ (9,482)	$ 106
Accrued salaries, benefits and payroll taxes	(2,962)	(6,171)
Accrued insurance and other taxes	3,208	4,978
Accrued income taxes	(5,675)	8,093
Accrued pension, postretirement and postemployment benefits	(252)	833
Other current and noncurrent liabilities	2,127	(3,402)
Other assets and liabilities, net	$ (13,036)	$ 4,437