Income Taxes Deferred Income Tax Assets and Liabilities Recorded on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Accrued employee benefits	$ 18,462	$ 21,463
Operating loss carryovers(a)	1,210,377	459,644
Pensions	61,308	64,799
Tax credit carryovers	1,270	11,634
Other	35,895	44,714
Gross deferred tax assets	1,327,312	602,254
Valuation allowance(a)	(1,213,750)	(458,288)	$ (69,900)	$ (84,137)
Deferred tax assets	113,562	143,966
Deferred tax liabilities:
Depreciation	(337,503)	(334,162)
Intangibles	(88,871)	(113,792)
Hedge of net investment of foreign subsidiary	(21,854)	(17,028)
Other	(31,287)	(24,265)
Deferred tax liabilities	(479,515)	(489,247)
Noncurrent deferred tax assets	17,029	25,108
Noncurrent deferred tax liabilities	(382,982)	(370,389)
Deferred Tax Liabilities, Net	$ (365,953)	$ (345,281)