Components of Change in Other Assets and Liabilities Net (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Schedule of Cash Flow, Supplemental
Other current and noncurrent assets	$ (6,139)	$ (3,729)
Accrued salaries, benefits and payroll taxes	(755)	(5,366)
Accrued insurance and other taxes	3,911	1,996
Accrued income taxes	16,678	(430)
Accrued pension, postretirement and postemployment benefits	4,281	2,122
Other current and noncurrent liabilities	(389)	10,171
Change in other assets and liabilities	$ 17,587	$ 4,764