Components of Change in Other Assets and Liabilities Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Cash Flow, Supplemental
Other current and noncurrent assets	$ 549	$ (2,797)
Accrued salaries, benefits and payroll taxes	(6,075)	(3,517)
Accrued insurance and other taxes	(1,213)	(2,383)
Accrued income taxes	(8,261)	(5,306)
Accrued pension, postretirement and postemployment benefits	1,538	1,903
Other current and noncurrent liabilities	15,047	10,470
Change in other assets and liabilities	$ 1,585	$ (1,630)