Components of Change in Other Assets and Liabilities Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Other current and noncurrent assets	$ (22,914)	$ (2,089)
Accrued salaries, benefits and payroll taxes	(21,335)	(12,926)
Accrued insurance and other taxes	(10,557)	(10,280)
Accrued income taxes	3,330	(8,473)
Accrued pension, postretirement and postemployment benefits	6,421	5,775
Other current and noncurrent liabilities	21,385	(6,281)
Change in other assets and liabilities, net	$ (23,670)	$ (34,274)