Components of Change in Other Assets and Liabilities Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Other current and noncurrent assets	$ (2,089)	$ (4,083)
Accrued salaries, benefits and payroll taxes	(12,951)	(13,703)
Accrued insurance and other taxes	(10,280)	386
Accrued income taxes	(8,473)	(46,700)
Accrued pension, postretirement and postemployment benefits	5,775	5,830
Other current and noncurrent liabilities	(6,282)	(10,827)
Change in other assets and liabilities	$ (34,300)	$ (69,097)