Components of Change in Other Assets and Liabilities Net (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Schedule of Cash Flow, Supplemental
Other current and noncurrent assets	$ 3,998	$ (42)
Accrued salaries, benefits and payroll taxes	27,911	(1,307)
Accrued insurance and other taxes	10,510	5,761
Accrued income taxes	7,096	18,369
Accrued pension, postretirement and postemployment benefits	(2,136)	(10,431)
Other current and noncurrent liabilities	(742)	13,228
Change in other assets and liabilities	$ 46,637	$ 25,578