Components of Change in Other Assets and Liabilities Net (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Other current and noncurrent assets	$ (9,691)	$ (5,501)
Accrued salaries, benefits and payroll taxes	(7,808)	(13,794)
Accrued insurance and other taxes	(256)	(1,278)
Accrued income taxes	(8,495)	(19,902)
Accrued pension, postretirement and postemployment benefits	11,757	16,283
Other current and noncurrent liabilities	(8,002)	(4,878)
Change in other assets and liabilities	$ (22,495)	$ (29,070)